you pay for what you get, but some workshops are rip-offs and may not know what they are doing. A lot of us have used many of the said workshops before with good results, my suggestion would be to drop in and visit some of the workshops and talk to the people involved and have a look around the workshop. If the workshop looks clean and the guys know what they are on about give them a go, just make sure you tell them exactly what you want and then listen to their advice about what the car/mods are capable of. Nothing worse than paying money (exspensive or not) and having the tune destroy an engine because the shop wasnt up to the task, having been down the path of new ecu, bigger turbo etc i would highly recommend x-speed or hyperdrive.