Holy obscurity Batman!
There've certainly been a lot of comic companies that've come and gone over the years and while there are some specific characters that I think are better than Harvey's (Stardust, for one) there isn't another company that's got as many cool characters as Harvey did.
are such great 60's style guys that they an easy choice as far as who I'd ask to do this. Brendon really went all out here (and Brian too). They definitely get points if for not other reason than they actually made Red Blazer look good. Think Gladiator's my favorite and I really like Firebrand's head shot on the side.
If you might be interested there's more about Harvey's heroes here [link]