cabinets

I am building a server platform, although the motherboard has a lot of pcie slots, isn't strong enough to handle multiple gpus if I make it sit vertically(in the usual way) in a cabinet. So I wish to buy a cabinet, which I can sit horizontally, so the gpu's don't stress the mobo. Any suggestion...

Please recommend the perfect case for Intel S2600CP2J motherboad and eVGA Bronze 750w SuperNova power supply and I would like to buy with minimum budget