No such thing, unfortunately. Onboard RAID chipsets, as well as all cheap cards (that I'm aware of), are still software RAID, though handled below the OS level.
I didn't know that. I assumed the chipset handled that function as a true hardware RAID implementation. In any case, CPU overhead or not, I know you can get a huge increase in disk I/O with a simple 2 disk array using the chipset's RAID
that's kind of what i was gathering while browsing newegg. the commenters were calling $120 chips "entry level". like graphics cards, the bus size with these can be a major limiting factor in their performance, so PCIe is better. Craig, your MB and mind both have 3 PCIe x1 besides the single x16 for graphics card.
that would make
this HighPoint RocketRAID 2300 our only and best option - and only at $110 (there are x4 cards for $350). we can also OC our PCIe busses up to 50% in the BIOS... it's hardware RAID including RAID5 and has 4 SATA ports that will point right at the front of the case. i'm guessing it's probably not "pure" hardware RAID, but it seems to have pretty high reviews.
it'd also work great in my case. the way the SATA ports are aligned on the MB annoys me. it makes 90 degree SATA wires lay across the board instead of away from it, and that's a bit of a wiring issue for me because my HDDs will sit directly next to the SATA area. with this thing, i can align them more easily, hopefully even with 6" SATA cables (that'd be great if they fit).
...crap, my PSU fan isn't working, gotta go.
edit... probably because it was cold

recovering from a bad system, not used to the new one yet.