Good suggestion from Spadesluck. It is not hard at all and can do it for half the price.
Agree with these guys. Super easy to do. I had never done anything like this before and was able to knock it out in a couple hours. After doing the first set I could do it in a half hour now. Much cheaper and gives you options when putting together as well.
Personally, I think the DIY coilovers are the best. You get to choose whatever spring rate you want, the length of the springs, and the length of the sleeves. Plus you can build them on whichever struts you choose. And coilover hardware also comes in different colors, if that's important to you.
Coilover hardware is pretty easy to find, so that shouldn't be an issue. You can find it on eBay, Amazon, and many automotive performance vendors (Jegs, Summit Racing, etc).
The downside to DIY is that you'll need to select all the parts (and make sure they're all going to fit) yourself. But there are several threads here on PFF to help with that. And you can always ask. Aside from that, the only 'hard' part is cutting the spring perches off the struts. And that's not really hard. You just need a cutting tool, and some free time.
If your wondering what shocks would be best to use for coilovers in the rear.. I would say Koni as they are adjustable rebound which is important and they have the adjust knob on the top so easy access...and as far as spring rates go...for a stock 2.8 engine 300lbs is a bit soft but good for daily driver and 350lbs is perfect for performance even with a 3800 engines weight. If you have a v8 I would go with 375lbs to 400lbs.