have you looked in parkers/glass guides etc? Surely that'd give u a good idea, then try your luck.
TBH you'll get loads of comments/values from people on here, but a lot of the time they'll be wrong.
As said on the numerous othe threads on the subject, if you get lucky and get a decent buyer they'll pay what they think its worth, and no more!
Criztal sold her car at more than everyone else valued it at, but Pete (icemans) LCR didn't sell....
Do autotrader/glass/parkers, take an average and then put it up for what you think. If it sells
if it doesnt drop the price!