EBay? Selling Full Alternators Set

I'm about to sell my entire alternators collection. I actually have two full sets of them. One set all opened and another still in sealed boxes. I plan on keeping the loose ones because I modded some of them and added reprolabels to them. But the ones still in boxes are the ones I'll be selling. As well as a Hasbro version of the MP Optimus Prime (the first edition one with burn marks on his body paint. Unfortunly his box is semi standard, he was never opened, so he is mint in box. Plus it has the talking stand that is way better then that second versions.).
What I want to ask of you guys is what do you think a good asking price is. I'm hurting for money at the moment, I really don't want to part with this collection. I need at least $1500. Saw an auction for a near complete set of 23 figures. The guy is asking for $1100. I have all 27 plus the MP Prime. Does it sound like a reasonable price or should I bring it down a little?
What I want to ask of you guys is what do you think a good asking price is. I'm hurting for money at the moment, I really don't want to part with this collection. I need at least $1500. Saw an auction for a near complete set of 23 figures. The guy is asking for $1100. I have all 27 plus the MP Prime. Does it sound like a reasonable price or should I bring it down a little?