I bought a t4-700 for same porpose from thomman and i'm very pleased with it. Light, cheap, good sounding, 4 vu's and 4 x 700w/4.Find an old Rane MA6. Nice little amps, and you have two extra channels. Also, if it matters, the channels can be paired and bridged.
http://www.rane.com/pdf/old/ma6dat.pdf
How much power do you need really? If you rack your gear, why not just stack a pair of stereo amps. That gives you a zillion options. 4-channel is rather specialized. There are new low weight amps that won't break your back. The Peavey IPR1600 weighs only 7 pounds, so 14 pounds for two of them. It is rated down to 2 ohms, but at 4 ohms it is rated 500 watts, more than enough I'd bet. And Musicians Friend has them for $239.
Peavey IPR 1600 Power Amp | Musician's Friend
There are also single space rack mounted amps, and a pair of those would take up no more space than a single 4x amp.
Find an old Rane MA6. Nice little amps, and you have two extra channels. Also, if it matters, the channels can be paired and bridged.
http://www.rane.com/pdf/old/ma6dat.pdf
How much power do you need really? If you rack your gear, why not just stack a pair of stereo amps. That gives you a zillion options. 4-channel is rather specialized. There are new low weight amps that won't break your back. The Peavey IPR1600 weighs only 7 pounds, so 14 pounds for two of them. It is rated down to 2 ohms, but at 4 ohms it is rated 500 watts, more than enough I'd bet. And Musicians Friend has them for $239.
Peavey IPR 1600 Power Amp | Musician's Friend
There are also single space rack mounted amps, and a pair of those would take up no more space than a single 4x amp.