Howdy, it's your friendly neighborhood web lurker here. As for book covers, I get all of mine done by my friend and former business partner, Don Semora. He has done professional quality artwork for some of the big names in publishing, gaming, etc. If you want to at least check him out, his website is
www.donsemora.com and trust me, he'll hook you up with some awesome covers. You should see the ones he's done for me! And no, I don't get anything out of saying this or promoting him except to refer fellow writers to a friend of mine who does top quality work for a good price. Believe me, if he didn't do good quality work, I wouldn't hire him for all my cover and publishing needs. And yes, I still do print copies of a couple of my books, but only because people want them. Otherwise I'm all digital these days. The majority I don't, but for those few that I do, he does the layouts and everything for them.
But even if all you want is a cover, he'll do you a very good, professional, eye catching cover.