Luckily as you're in the North East you've got the legend that is John-ST3 available to you. He's the guy most of us go to if we ever have a problem or if a mod needs fitting.
People say a remap completely transforms the car, I didn't think it would be that different not knowing any better as this was my first turbo'd car. My god, it's like driving a petrol turbo for the first time again
Here's my quick rough guide that I keep handy
A few things to get you started:
22-25MPG average
55L tank costing around £70 to fill with V-Power
240-280 miles typical range
30+ achievable on a long run (I did a 360 mile round trip to Liverpool and back to Newcastle and got 35MPG)
Tyres are £80 a corner for midrange, up to around £115 for premium
Common Faults:
Alternator - £200-£250 (although I keep seeing £400-£450 mentioned)
Oil Filter Diaphragm - £150-200 (Cheapest is currently £146) - Revised part fitted as standard to the Facelifts - 2008 onwards
Slipping Clutch (Occurs normally only after remapping) - £725-£850
Undertray being obliterated - £53.23
Modding:
Remaps: Stage 1: 250-270bhp (Can be done on a completely stock car)
Remaps: Stage 2+ Completely depends on the tuner. Collins Stage 2 for example requires full mods but is 320bhp, while Bluefin can be put on a stock car but will only run around 270bhp.
Intercoolers: £260-£500
Full Exhausts: £600-£1,000
Induction Kits: £250-£400
Eibach Springs: £200 fitted (Most say this is a necessity)
Bilstein b8: £550
RARB: £150-£200