Is that all windows (except front windscreen obviousally!) for £150?
Thats a very good price if it is. Id expect a minimum of £180, and easily £200 for a top quality job.
Black looks good on any colour of car IMO. Have you noticed how quite a few cars in TV adverts have black windows? Dont go too dark or you will have the police stopping you every other day...
Dont go for anything else other than black, unless you have a car whose colour suits mirrored tints.
If you can get tints that make rainbows like mine, get them, it pulls all the birds!