Thanks guys!
It looks like RoE and Disposable Heros are both good options for what I'm looking for. I do have Iron Ivan's F&I War rules, "This Very Ground" - I haven't played them yet, but they seem like they'd be fast and fun, but still "realistic".
Once I collect some vehicles, I'd love to include them in games (of course) - but not like 40k, with 4+ tanks per side on a 4x6 table. Something a little more "realistic" - probably more as part of a scenario.
I still need to look into Battleground WWII and World at War. I have seen Nuts, but I'm not a fan of 2HWG games (maybe because I haven't played yet...), and it seems best for really small games - smaller than I want to do.