Well, yes the ARC M070 is really the best option, and I myself have one (from my website:
http://engl-labs.tamu.edu/clas...V.htm)
Here is one on eBay:
http://cgi.ebay.com/New-ARC-St...wItem
I got mine for $250 + shipping, so that may still be out of your price range. I originally wanted to use a JZA80 (MKIV Supra TT) SMIC as it is HUGE, but a custom cold pipe would have to be fabbed, negating the $100 entry price for the cooler. The RB20 uses the same core as the CA, just different end tanks, so that is a worthless upgrade. Also, look into a waterspray setup. All parts ran me about $12 for one, and I ran that for about 6 months on the stock SMIC without drama (at stock boost that is).
As far as the vent on the fender liner, you could use the ARC Titan (titanium) Wind Master. It is designed for that very purpose, and just rivets on.
http://www.overboost.com/obs/p...amics