WorryFreeLabs was surprisingly affordable. My partner Lance and I 'bootstrapped' these design costs with our bonuses from our day jobs (and didn't exhaust our bonuses with it). Without question, I'd recommend WorryFreeLabs if you're looking for a group to take your idea and bring it to life in design. We're continuing to work with them as we build out page99test.com, and they're as fantastic as ever.
1-5k? 5-10k? More?