Alrighty, I've put the kettle to boil - here's some analysis of Birdsie's pre-made builds and maybe some of the extant write-ins.
[] Eldritch Overlord
Arguably THE muscle wizard path, E8 is the maximum we can currently access - which grants 15x healing, 25x peak human physical performance, and defenses sufficient to require mass artillery or magic bullshit just to pierce. One could even throw in Pentacles/Cups for immense amounts of synergy. This is certainly an unexpected direction to specc into - who would possibly expect the person titled the Magician (or whatever hero name we settle on) to run at and shatter you, your armor, and the brick wall you were hiding behind - but there isn't a significant amount of focus put on the Role's actual purpose, which is casting spells. While this can be mitigated somewhat via Eldritch techs it won't be as good at Wizardin' then any other build.
I'll also comment on its current player-made derivative, Modified Overlord (by JOEbob). Mod. Overlord focuses on leveraging the Techs that currently have a discount (Arcane Induction, Connections, Idle Study, Comfort's Embrace) with the possibility of Cups / Wands to supplement spellcasting. Sidenote: I think Connections' starting level is 1, not 0. Anyhow, MO adds some caster flair and long-term growth to Overlord in order to mitigate most of its faults.
[] Esoteric Ravager
This is the bog-standard "IT'S WIZARDIN TIME YOU SHITS, GET FIREBALL'D" build, but is no weaker because of it. Its standout characteristic is the fact that it probably levels HtD the highest of any build currently floating around - and supplements that with Devotion | Swords in order to turn Sol into an arcane artillery emplacement. Its main weakness is a lack of utility, as in order to properly leverage half of its bullshit we'll need to go in pretty hard with Swords (which is the least versatile of the four devotions). However Sol would dominate wizard duels, be a decent combatant vs. Enrolled, and A7 is arguably where the big Arcanum power spike is anyways.
[] Wizard's Tower
Probably the all-rounder build, WT suffers somewhat from a lack of focus - it isn't as good as any of the other choices at anything specific. On the other hand, this can be a strength. While I love Devotion | Swords, pivoting to Wands would turn WT into a build focused on maximizing Caster Bullshit to an absurd degree. It has the added advantage of the second highest Sanctum level of the extant builds (excluding write-ins), allowing for a deployable oh-shit button and a Sol-cave (name pending) to nap / plot in.
[] Yer a Wizard Sy, in mah Tower.
I suppose I can mention another write-in, this one from _brightwing. Equally an all-rounder build that integrates the long-term growth of Modified Overlord alongside elements of familiarcraft and also making Symon a wizard with... Wizard Tower's multifaceted approach. While it does somewhat suffer from a broad focus, its use of force multipliers like summons, Symon (now with magic!) and Devotion | Wands makes it a potent contender.
[] Penultimate Sloth
This would be the sleeping giant amongst the Birdsie Builds. High Sanctum, passive income Techs, and little investment elsewhere. This would allow a loop in which Sol naps for a month, gains like a class worth of XP anyways, then does a boatload of classes - all with positive Will gain. It does suffer somewhat from not fully taking advantage of Sol's more potent aspects with this massive boon of EXP, long-term Sol would experience an absurd amount of growth.
Anyhow Rihaku just suplexed some plans here so now I will analyze them because (as per usual) I really like them.
[] Be Water, My Friend
The first (i think) plan focused on the Devotion | Cups arcane foci, BWMF is focused on high Will gain - with a side effort on Potions and Connections, both worthy ideas. In the short-term it suffers from Cups' lack combat capability without pre-emptive alchemy, however it also doesn't need like four or five levels of Sanctum to go online.
[] Simple and Good Part II
Electric boogaloo, I want to Maximize Magic with you. This exists in a similar space as Esoteric Ravager, except with a (slightly) lesser focus on Hermes the Destroyer - and a greater one on Comfort's Embrace and Connections, allowing for both a more active Sol and general Architectural Bullshit. Honestly this is probably among my favorite plans, and certainly fulfills its promise: it is simple and good - I can find little fault in that!
So what am I voting for? To me, the greatest expenditure of EXP here should be on two things: combat first, and growth second.
[X] Esoteric Ravager [7 Credit]
[X] Eldritch Overlord
[X] Write In: Modified Overlord
[X] Simple and Good Part II
[X] Yer a Wizard Sy, in mah Tower