There are thousands of choices for each item on this list. Pick a brand and price point you are comfortable with. For me, the goal was to stay below 800$ and to be able to hear the music on the freeway ( something i couldn't do with the base system. OK, i could hear it, but it sounded terrible, so i usually had the radio off.)
OK,here are the details:
Head unit:Pioneer P8000-BT
Speakers: Pioneer 6.5 and 3.5.
6.5's are TS-A1674R
3.5's are TS-A878
Sub:JL Audio 8" 8W1V2-4
Amp : Boston Acoustics GTA704
The total,with the adapters for the antenna, steering wheel controls and the wire harness came in at $812.32.
I ordered the wrong dash adapter the first time, and the wrong antenna adapter. I'm not sure how, with 400 stereo install write ups on this forum alone, but Amazon took them back free of charge.
All in all, i am very pleased with the set up. I am still in the tweaking phase, trying to find a little more mid range. The sub / amp combo puts out way more bass than I need and can rattle the windows with clarity. I have the amp powering the 6.5's as the front channels and the sub bridged from the rear channel. If you already have the monsoon, I'm not sure how much of a jump this will be for you,but if like me you have the base system,this is a huge improvement.
no pictures are necessary as you have all seen a solstice or sky a million times. Everything is in the stock locations with the sub mounted behind the drivers seat on the wall. The sub went in to a stock sub enclosure I bought two years ago for this project. It was not modified at all,but the sub did get a .5" spacer for clearance. My rear wall did not have an opening for the sub, so I cut a whole in it. I will be finishing that off at a later date, but overall it looks good. The basket hides my edges and the sub just pokes its face thru the hole. Other than the head unit being a little different,everything looks like a stock Solstice, which is just how I wanted it.
One final note: I have to thank my Brother for his unwavering patience and persistence. I might have lit the car on fire a few times if it were not for him. Thanks also go out to DBG for laughing at me and being available for long phone chats during some difficult times. Lastly, the best write up I could find for trouble shooting the steering wheel controls was Morfious' install thread which is somewhere on this forum.
For my fight with the AXXESS SWC adapter, see here
http://www.kappaperformance.com/forum/index.php/topic,8332.0.html