I got a personal loan today from Prosper with an interest rate of 6.86%. It was only for $6K, but it was for 60 months...I really do like Prosper.
Someone earlier today mentioned that Lending Tree gave them a better rate than Propsper did....so it may be worth a try.
I've used the prequal page at Credit Karma 3 times and always gotten at least one good offer. Of course, I could have shopped 10 or more lenders one by one, but one stop shopping worked for me.