I'd avoid the old Compaqs, actually. The damn things use mostly proprietary parts that are difficult to replace (or upgrade) unless you get them from another Compaq.
Personally I'd just stick with DOSBox. I've never seen the allure of mid-90's computers, they're all just soulless gray identical boxes, and there's little challenge in setting them up. Older PCs from the very early 80's are much more interesting.