Offshore books, I use 3, all of mine are US friendly.
Nitrogen Sports - bitcoin only book, and pretty anonymous.
5 Dimes - Reduced juice option is best around for US customers, -105 juice on almost all football games, and most props around. Also best options for live betting. Accepts bitcoin for deposit and payouts but bets are in US Dollar.
Bovada - Best line on underdogs, but quick to limit you on your bets to super low levels if you routinely bet dogs and win. Seems slower moving with lines.

Most important thing is getting your money out, and I have never had an issue with those 3. I rarely use Bovada anymore. Having multiple outs is a good thing, and will increase your bottom line.