I'm in the market for one as well. I'm setting up my first RAID setup w/ 4 Western Digital 120's and was currious as to what is the RAID card of choice.
It depends on the level of RAID you're looking to do. You can get an inexpensive adapter that will do RAID 0, 1 or JBOD, but not 5. For RAID 5, you'll need something a bit more high end. That said, Adaptec and 3Ware both make excellent IDE RAID cards capable of RAID 5. The Highpoint RocketRAID is probably about the cheapest you can get, but only for RAID 0 or 1, not 5.
This article is a little old, but still has a good deal of great info.
Also, if you find what you're looking for, I'd suggest ebay for the final sale. I bought an LSI MegaRAID 1600 SCSI card for about $130 new OEM. The retail goes for around $800 on LSI's website. Just a thought.