Currently on my third self fitted car kit, over about 7 year period due to changes in car, 2 Nokia kits then an Ericsson. Reckoned that the Nokia kits where slightly better.
Go manufactures own kit every time, both for acoustic and build quality.
Check these guys out, both for range, and what appears to be competitive pricing
www.expansys.com
My install times appear to be inline with pilotwolf’s; it’s actually quite a rewarding simple task to do one afternoon
Good luck