A 1200 should be fine, if I remember rightly (its been a while!) there's no faffing about with older games, you just need the right kickstart disks.
Failing that a 500+ or 600, the stock 500 only had 1/2mb, the + and 600 had 1MB and the 1200 had 2MB. It doesn't seem like much but games like Settlers are infinitely better on the 1200 (well, with 2MB).