[CentOS] OFFTOPIC :: IB hardware choice

Hi! I would need an advice from those that use IB (as admins :) )
i have a choice between :
1. Mellanox InfiniHost® III Lx HCA card, single-port CX4, DDR, PCIe
x8, mem-free, tall bracket, RoHS R5

2. QLogic Single Port 20 Gb InfiniBand to x16 PCI Express Adapter
(Single Pack)

aside the price is there anything else that could help me make a 
discrimination between this two?
(these will be used in twin servers for a small (up to 24 nodes) 
parallel cluster)
Thanks!
Adrian

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