Implants are expensive so maybe also look into going abroad - to Budapest or even India (some excellent dentists there).
I would really recommend http://drmotiwala.com
in Hyderabad where its 750 USD per implant and crown - if you have a few to do it more than pays for the flight and a holiday to see the colourful India!
I had 2 implants done in India a year ago and they are perfect. All fitted in 3 days and no follow ups needed. The only thing you need to be careful of, is only chewing lightly on the implants for the first 3 months.