I know Yo La Tengo has a lot of keyboard stuff in their stuff, even if there's only one guitar. I'll definitely second the Dragonforce too.
Ted Leo and the Pharmacists (yeah, yeah, I know, I drop this name a lot) have two guitars in their lineup now in live shows... No keyboard though. Same goes for Sleater-Kinney, as far as I know. Pavement? Shit I don't know WHAT they got into with some of their studio stuff, but if you count Malkmus doing any track layering (that bastard does it all the time), then you'll definitely find a few things (think Range Life) with that lineup in a studio situation.
*sudden realization* Derek and the Dominoes (solo Clapton in some cases, for that matter), the Allman Brothers, and Lynyrd Skynyrd (pardon the third guitar in Skynyrd)! Especially the Allman Brothers. God I love those guys. I think the Eagles had that guit+guit+keys+drums+bass lineup and they pretty much ALL sang, if that works. Jimmy Buffett... shit, his lineup is always different no matter what, but he occasionally uses that lineup ("Grapefruit, Juicy Fruit").
Just about any country music will have the lineup you're looking for. I'm fairly sure that's the lineup Garth Brooks had when he did his famous world tour show at Madison Square Garden, 'cept with the occasional added harmonica and acoustic guitar on Garth's part. Joe Diffie and Billy Currington... I can never tell what they're doing, yo. If you count a steel guitar as a guitar, then yeah, go for those guys.
Also, Beatles. Beatles Beatles Beatles fucking Beatles. When they did studio work or had Billy Preston hanging around, they could have that lineup, definitely.
And don't forget, just about every contemporary Christian band EVER uses that lineup.