buy a goldmine record guide if you intend to sell more music down the road(they are fun to read anyway). you will most likely(over a short period of time), find the approx price of each on ebay. do not sell as a group, unless you are willing to take a bit of a haircut. all that said, there is nothing worse than selling great records and not factoring in their 'real' sentimental value to you. unless you really need some immediate cash, my advice would be to keep them. if in a few more months you still feel the same way, put them up for sale. if not, you've saved yourself from a homer simpson moment.