Fair enough. I've just always had a lot of love for that book, but Hawkeye/Mockingbird are also my favourite superhero couple--so that certainly helps.
That was their last significant present-day confrontation, yes, although he turned up in big group scenes of villains in Bagalia during Clint's stint as leader of the Secret Avengers in Remender's run.
Although I did like what Fraction did with Barney in his HAWKEYE series it is a bit strange how quickly and thoroughly Barney was reformed. With Barney good and Oddball dead, Crossfire is really the main member of Clint's rogues gallery that is still around.
He has 'borrowed' a few others, such as Bullseye and The Hood in FREEFALL, and before that Helmut Zemo was carrying a major grudge against him over Clint putting Moonstone in a coma. But Zemo is always going to be more associated with Captain America. Bullseye is always going to be more associated with Daredevil (as he SHOULD be -- I hate the idea of the Dark Avengers members suddenly becoming rogues of the Avengers they posed as just because they happened to borrow their old clothes). The Hood has much more history as a "team" villain rather than a solo hero villain due to Bendis' work with him--but if they keep Hood at a more reasonable power level, he
could be revamped into a solid Clint foe.
I'm not so sure about that. Crossfire's background is as a CIA operative, and apart from his cybernetic eye he doesn't really have any superpowers. You could take him out of the red and white costume, dress him in a more 'secret agent/tactical gear' type of outfit, and he's be the same villain he is now but with a look that is more in line with the 'no costume' approach.
Hopefully Clint isn't permanently locked into the costumeless direction anyway. FREEFALL had him in both his Ronin and classic Hawkeye costumes in addition to his current outfit (and a cameo by the Goliath outfit) and he also got out the classic suit for the "No Surrender" weekly AVENGERS book too, so its not like they've completely turned their back on the costume.