Hi there,
Don't trade a 1200 for a 2000.
Amiga 2000s are often sold on eBay. I purchased one last year and three more for parts. (I'm a bit nostalgic about those machines.)
I recently saw one with a starting bid of 9.00 US dollars.
Just set up a saved search on eBay for Amiga 2000s and you'll soon find one for cheap I'm sure.
Keep your 1200.
Note: 2000s are a bit heavy and some eBay users aren't too enthusiastic about proper packaging.
Fester