Since wizard tower is winning pretty crushingly here, it might be time to start thinking about exactly what our wizard tower will need.
As you may recall, a tower provides bonuses to the purpose for which it is dedicated; when we were discussing building a manor on our fief, a lot of the plans had multiple towers in them so that we could have an enchanting bonus, research bonus, etc. thanks to each having a dedicated area. This is pretty flexible; it can even provide a bonus to
reading tomes which of course makes a dedicated reading room mandatory for any place we're planning to settle in for serious research. Building towers was 100g each when we were building a manor but who knows how much it would be in the Karak. Presumably, our plans to move in will involve more than one "tower" room type mechanically even if they're physically more compressed; maybe a large tower has one bonus available per floor or we'd have a suite of rooms in Karag Nar.
The other nice way that a home can provide bonuses is via libraries. Having a relevant library at all is +1, +1 more for Extensive, and +1/+2/+3 for increasing levels of rarity, all of which stack, so an optimized library can give you up to +5 on whatever project you're working on. Unfortunately, getting a library on a topic takes an action and upgrading it by one level does the same, so it takes a staggering
five actions to get a full library bonus and that will still only apply to one topic. As far as I know every library action is only 50g no matter what the topic or upgrade level, though.
If we need to outfit each room with 100g and one action each and each library upgrade with 50g and one action each, which is in line with previous costs, it could take us literal years just to finish our home. Most of that would be chasing library bonuses, admittedly, but if we're going to be doing serious magical research we
really want those library bonuses.
Avoiding this huge timesink is a high priority, I think. Maybe we can pitch the necessity of having a well-equipped library and tower down in Karak Eight Peaks to the Grey College and get them to assign their librarians+scribes to outfitting our library for us, and one of their numerous apprentices to picking up laboratory necessities? They have a lot of professionals who would be able to fairly rapidly select and then have copied key tomes on the topics we'd be interested in, and we
do still have that College Connections trait. I'm thinking that greenskin lore, skaven lore, general magic, enchanting, and grey magic are critical and more specialized topics like waystones and Qhaysh are maybes. Convincing them to do this for us and save the associated action slots might be a good way to spend a large chunk of our wealth; I could easily see us spending 2000g on a quality library and several hundred more on employing their scribes and librarians so that we don't have to spend the action slots.