looking at your sig I see you running a v1.6 box. These boxes require the white SP adapter witht the LEDs that your referring to. For a successful SP adpater install, all five LEDs on the adapter should light up when the chip is not installed. Then once the chip is installed the light second from the end (LED 2) show no longer light up. Is this the LED you're referring? If you want you could remove your chip, power on and see if it works.
As to your drive selection, the seagate one you're talking about looks good. for a 200 gig drive, you're quite safe running only an F partition as the F partition wont be larger then 237 gigs (greater then 237 gig = prone to FatX corruption). If it was going to be larger then 237 you'd want to run F plus a G partition (F gets 137 gig, G gets the rest).
Goodluck with the seagate drive, I hope it works better for you.