I think the Ts fits perfectly... Small home, doesn't need anything "extra" added (you said the room is warm enough), very inexpensive to care for/feed, can be handled, you probably have almost everything for one, isn't expensive up-front either, and you talk about them fondly. You could definitely take care of a Ts, and they have pretty long life spans (especially for being a spider!) and have personalities.
And we all know Nathan is on board for a Ts!
Kaida- CT Female 2.5 Gal.
Julep- HMPK Male 2.5 Gal.
Fandango-HM Male 10 Gal.