your ssd's will give you much better iops even with a bottle neck. high end SSD's can max out sata6, id give it a shot and go with it. 2 sata2 ssd's will beat out a single 500 sata3 drive easily.
I think you read my post wrong.
Raid 0 with my 2 SSDs one which is SATA2 and one is SATA3
How much of a bottleneck would this be?
Use SATA3 SSD and 500GB Stock HDD as storage.