What would you like to know?
Bluefin is probably the most convenient. You get a handset that enables you to rewrite the map/return to stock as required. Plus you may be able to sell the unit on when you are finished with this car. Plus they have a 7 day refund policy if you are not satisfied.
The others sound like a single shot map, which may be the better choice if they are cheaper/you plan to keep the car for a prolonged period/are sure you will be happy with the end product..
Dreamscience do not cater for Vx except the VXR. But their reputation and service is very good. They are predominantly Ford tuners.
With most FWD turbo cars, remaps usually cause issues with the clutch slipping. Especially if it has been previously abused. Drive shafts can go, Ford are particularly notorious for this.
Insurance will go up and most mainstream insurers will refuse to cover the remap. Use someone like Chris Knott or Sky to get better prices.
LinkEdit: Pre and post dyno results are usually a great way for tuner to get more money from you. Results are usually operator dependent, highly variable and of very little use other than bragging rights.