Pretty much all World Challenge and IMSA Mustangs incl the new GT4s run 18x11 Forgelines with 305 slicks, just FYI.
http://www.forgeline.com/
Can spend $4k or more per corner with these guys and HRE without even thinking about it.

I spoke to these guys a while ago; they are no Forgelines or HRE's but you can get into a semi custom wheel starting about $550 US with plenty of colours, styles and sizes. They are not the lightest, and frankly nothing in 19 or 20 comes close to the potentials of a 18 or 17 in terms of performance anyways.
http://www.forgestar.com/wheels/

Some standard Mustang hub specific models are avail at AM, starting around 300 USD when they go on sale. https://www.americanmuscle.com/2005w...html#shop-by11

20" wheels n tires are going to be 60 lbs+ each which is not exactly the bomb for ride comfort, handling or accell/braking performance.

These are very interesting, http://www.carbonrev.com/cr9/


as are the Ford Carbon wheels off a GT350R: They dropped the price on them recently, Uncle Ed will be able to hook you up - they are 19s tho.


Welds, CCW (owned by Weld) and a few others like Enkei are much better quality and stronger than the typical, but it's your car so you're the boss.

LOL every time I read your signature - one of the best sayings.....ever!