I don't use offshore ...but the 2 obvious ones are BetOnLine (BOL) + Bookmaker ...from past members commenting + word of mouth ...but members here will let u know ..cause there are others
What r u looking for? Soft lines, bonuses .reduced juice?excellent customer Serv..?? Then someone will comment more towards your liking ....quick payouts? Are u prepared to deal bit coin ..alot of them prefer that now