The one aspect and very important thing not to be mentioned yet: if you upgrade an A2000 to 1mb or 2mb Chip Ram, you're pretty much in the clear to run 98+% of all Amiga software ever produced for an Amiga. AGA was nice when it first came out in the early 90's (and almost compared to VGA color wise), but just about every program was written to be cross platform'd for universality.
AGA IMO is overrated. Sure... there a 'few' games that are AGA only, but you ain't gonna miss them today.
IF you have a chance to get an A2000 cheap, especially with a video card, that's the way to go IMO. PLENTY more upgradable and affordable options. Not to mention superior build maintenance wise (socked chips vs. surface mount, etc.) A1200, you're always gonna feel like it's cheaply built comparatively and UBER expensive to upgrade.
BTW: ECS Amiga's are soon to get the Indivision treatment - so no worries that way either.
Legacy A.org users: sorry to sound like Doomy, but considering his quandary... lol
