Install them yourself, use the factory brackets, I had to dremel mine out a bit to accommodate the 6.5 Boston Acoustics I used in the front, the tweeters fit fine.

The rears will need spacers to clear the magnet, mine are made out of 1/2" thick plastic, and they too fit with no obstructions.

The reason I say get a 50W headunit is amp mounting, there's really nowhere to put one out of the way except under the passenger seat, and you're limited there.