I've has a quote on getting my Alfa sprayed and it was a lot cheaper than some people have been quoting on here. I think the GTV is all normal glass in seals no bonded screens.
When it comes to paint, unless you know the person, its pretty much a case of you get what you pay for. If you pay 800 quid for a "full" respray it will look like a dogs breakfast compared with a 2000 pound job and 12 months later will need touch-ups more than likely. Likewise the 2000 pound job wont hold a candle to a 5000 pound job.
I always recommend getting a range of quotes from various reputable body shops to get a ballpark figure. Usually the ones that specialise in insurance jobs will quote you exorbitant prices OR too-good-to-be-true cheap prices because they either don't want the work, or just want to do a cheap, crap job to get it out the way as they make more money in insurance jobs. So by getting a range of quotes you may get prices from a grand up to 3 or 4 grand and probably find you might get 3 or 4 quotes around similar figures, they are usually the ones I would recommend people to go for unless they know the bloke who gave them the cheap quote and can ensure the job gets done properly.
Most cheap quotes just tape up the car, if you're lucky they might remove the badges, then they just give it a quick rub back and then spray it. They won't repair the little imperfections (that are very noticeable with new paint) and you will usually get clear signs of overspray and tape lines. Which is why I would never recommend a respray on the cheap unless its a mate doing a favour.
End of the day, if you're going to do it. Do it once and do it right. Getting a sub 1k respray and then having to take it back every 12 months to get this or that touched up will probably cost you more in the long run. Sure, if you just want to respray it cheaply and sell it on in 6 months it might be worth it, but if you plan to keep it, just pay the money and do it right the first time around.