Agree. Crossfire or SLI'ing low end cards really will not give the performance that you would be looking for. The best bet would be to put put the money together and get the fastest single card you can. Then later on if you still want to Crossfire/SLI you would have a much better setup.
Crossfiring low end cards is not worth it. Just buy the fastest single GPU you can buy.
agreed. not to mention you pay more for a proper crossfire capable motherboard (by proper, i mean one with at lease a 8x/8x slot configuration, not the cheaper boards with 4 x slots which don't perform properly with crossfire). for $20 more than a 7770 you could also get a faster 7790 or a nvidia 650ti.