JackNaylor is probably right. Depends on your propensity to mod. If the case is pre-1995, then it predates the ATX form factor, and your standoffs won't fit.
The Antec case Jack recommends is good, but if you have some extra 120mm fans in your leftovers, this is a better choice IMHO: Cooler Master HAF 912
There are not a lot of good cheap cases on sale at Newegg today. Guess they are gearing up for Sandybridge this Wednesday.