The choice would be either Dubai or Bahrain. However I would choose Bahrain cause Dubai has got too crowded. The reasons are below.
Cost of accommodation comparatively much less than Qatar or Dubai/AXB. You can live in a villa with swimming pool, tennis courts etc at unbelievable prices. Quality of accommodation in Qatar is pathetic.

Cost of communication – telephone, internet etc much cheaper. Qatar has one of the most expensive calling rates in the world. The telecommunication market has just opened up but it will take time for the rates to reduce.

Small place – so it does not take you long to get anywhere unlike Dubai where you’ll spend 1-2 hours traveling around.

Cheap booze – can pick it from the airport duty free unlike Qatar where you need a license. You can wine and dine at most restaurants (don't get tht in dubai even). Great restaurants too.

Advanced banking facilities.

Taxation - In Qatar if you do not have 100% Qatari shareholding you will be taxed. Tax is on slabs and is around 35%. Even QFC licensed firms will be taxed from this year although taxation rates differ

Most importantly it will be close to the biggest market in the GCC – Saudi (just a 40 min drive through the causeway). That seals the deal.