Not sure what the going rate is, but if you end up spending as much as an aftermarket set goes for, I'd say you spent to much! Te buell ones are decent, I have them for my bike, but I feel like an aftermarket set would be better..,
Do you only want buell brand or hard bags? If not I run a wolfman beta tailbag, it has legs that drop down each side of the seat its pretty big but can be drawn down. Comes off quick carries like a duffel. Plus has straps to hang things outside. $170 ish