You cannot go wrong with America's Aircraft Engines. You will see Steve or Richard Fowler at the ECI tent at Oshkosh and Sun n Fun. They are top notch guys. They are also in the Tulsa area.
[ed. I would like to add that they are an advertiser in the VAF Forums! dr]
Both are very good engine builders. My friends here in WFalls with an RV-10 chose a Barrett IO-540 and I've personally got almost 80 hours now in an RV-8 flying behind an ECI IO-360 from America's and it's been a rock solid reliable, and very smooth running engine.
I got a great deal from Aero Engines Of Winchester as did two of my friends that I refered. The guys name is Tom Schwietz 540-678-1661. Give a call and get a price.
I should have clarified that my engine kit was originally purchased from America's and built at my house. It was later sent to Barrett's for their treatment
Agreed that the Fowler's are some of the nicest people in the business. They will have competitive prices and great service before, during and after the sale.