I could look for another name but I've thought of one that is particularly appropriate and its being squatted on. However I think you're right; investing time thinking of others names is more effective.
tdnam.com; click on advanced search; click on Expired Name Auction checkbox and .com checkbox; type in a keyword to search on then click search. Give it a chance, do a lot of searches. I found some really good domains the most recent one I bought was "askshare.com" I paid $20.
Surely you can find an appropiate domain name that isn't taken.
Make an app people will want and find a way to reach them. Your domain name should be the least of your worries.