Okay, more like asymptotically approaching aural nirvana, but I am thinking I am going to have to spend a LOT more to get a better sound. I wanted to document it for others. I have spent about 20 months trying out different stuff to get this configuration. I will also note some less costly alternatives.
Tweeters: Scanspeak 1" Illuminators - The stock tweeters are mounted in the sail panels and I initially started with Dyn MD100s mounted slightly on-axis in the stock locations and found they provided a very large soundstage. I had the Dyns for about 6-7 months and loved the soundstage but found they were a little dark and ended up getting a good deal on some 3/4" Scan Illuminators.
Several people suggested I try the A-pillars and my friend Glenn (GLN305) came up with his brilliant tweeter pod idea and so he mounted the 3/4" Scan Illuminators on-axis in tweeter pods on the A-pillars. However, I never got the wide soundstage that I had when the tweeters were mounted in the sail panels. I thought that a 1" tweeter might widen the stage so I then tried Seas RT27Fs which I got a good deal on from a fellow forum member. However, I never got the wide soundstage I had before. After 10 months with 2 different tweeters mounted on the A-pillars, I decided I wanted to go back to the sail panels.
I liked the Scans and though and got a good deal on the Scan 1" Illums. Glenn was kind enough to fabricate beautiful tweeter enclosures using my sail panels to mount the 1" Scan Illums partially on-axis. The resulting soundstage is very wide, wider than the car. I am now very happy with the soundstage. The Scan Illums are superb tweeters, revealing without being overpowering.
The moral of this story is to check out different placement options for the tweeters, because placement can make a BIG difference. Try the stock locations, try the A-pillars, try on-axis, off-axis, partially on-axis, etc.
Woofers: Another friend from the forum, Corey (Dr.TelepathySQ), reccomended these to me. Glenn concurred that these were excellent mids. I found a good deal for a used pair from someone on the forum. These are superb mids. The difference between a 6.5" woofer and a 7" woofer is quite noticeable. Very neutral, superb sounding mids. The Seas are admittedly a bit pricey, but worth it. You may also consider the Usher 8945P, which is supposed to sound similar but is significantly cheaper. I had the original ID OEMs before the Seas and I was quite surprised at how close the ID OEMs came to the Seas at only 25% of the cost.
Subwoofer: Morel Ultimo 12" - The most transparent subs I have ever owned. You hear just the music, not the sub. You can't tell the sub is on. I am running it sealed, in a 1.25 cu ft (net) enclosure. I got this used from someone on the forum. Again a bit pricey, even used. I recently tried out the Dayton 12" HO in a Scosche 1.25 cu ft sealed enclosure and was surprised at just how clean and transparent it sounds. The Dayton 12" HO would be a good alternative for a budget setup.
Amplifiers: Cadence A7Hc class D mono amplifier and Digital Designs S4.