my suggestion is go with the onboard RAID, it will be the easiest for you. The bigger question is what type of RAID do you want to use?
I guess I could just save myself the hassle and go with two sets of external RAIDS (one for work, and one for backup) but I've heard that having an Internal work RAID gives you better performance. Any truth? Any card suggestions?
The only drives you want to be RAID0 are your OS/boot drive, your swap file (with enough RAM, you don't need a swap), and if you have your programs installed on a different drive. You would probably want 2 x 120GB SSDs. Then you have a 2nd array running 4 drives in RAID10 that stores all of your data and an image of your RAID0 array.
And thats how you get ants!