Thanx for all the responses...
Grim Tales: Dang it! I actually owned this book at one time... I'm pretty certain I got rid of it in one of my purges of unused / unlikely to ever be used gaming gear. I feel like an idiot, too, because now that it's brought up I can't even remember much about it. I may have never given it a thorough reading... ("Fortunately" I've found a cheap copy on ebay...)
Lankhmar: I hadn't really thought about BRP, and if I don't go d20 I'll probably end up going with Savage Worlds. Also, while I really haven't looked too closely at the new Mongoose versions of any of this stuff, what I have seen (which is pretty much limited to cover art and bad bindings, I really haven't looked at the content much) hasn't impressed me much. Maybe that's a mistake, but unless the content is really significantly superior I think I'd probably be happier pulling out some of my old Chaosium stuff...
True20: I had thought about True20 (heck, I had actually thought about Mutants and Masterminds), but I'm not sure it's "d20" enough for those players who are the reason I'm not just going with Savage Worlds...
E6: That's a good idea. I might even be able to do something with Conan or Iron Heroes at that point. With just D&D I'm concerned that I'd be limiting things a bit much if I take all of the casting classes out of the mix. I'm not planning on running anything right away, so I may wait for Conan 2e and Fantasy Concepts and E# one of them...
RFisher: I'm not sure exactly how to work a skill-based BAB / Saves system. I'd think you'd have to either make BAB cost more or else split it up. Splitting it up might work, but I'm not really sure I want to go that route. Otherwise, I think you'd end up with the equivalent of giving every character Good BAB. Of course that might not actually be a bad idea...
Savage Worlds: Yeah, there's that too.

I've got a few players who don't really want to play non-d20, tho. :\
Also: I don't have Mastering Iron Heroes, but I expect at least two of the players that I'm catering to would immediately choose token-based classes and then be paralyzed at the table and unable actually to play them...

(I wish I was joking.)