How to choose a RAID Card?

I built my first 1U server to colocate, great setup. Dual quad nehalem 5520's, 12GB Ram, 2 Sata 320GB HDDs, etc. I accidently ordered a pci 64 (or something) raid card, so it wouldnt fit. I need a PCI Express raid card for 2 HDDs to run RAID 1. I am in dire need of help picking one out in the 1-200$ price range. I dont want to skimp on it, but I cant afford the top of the line either.

I need to ship this server off asap so any links or info on good RAID cards would be most appreciated. I prefer hardware RAID, but really I will do either as long as its stable.