Check out the Art Morrison Multilink IRS. We have it on two of our cars.
After doing larger tires and suspension to the rear, you will find the front needs lots of upgrading too. A first gen is limited on front tire width due to the wide frame rails. An aftermarket front subframe should be added to your list which will gain you 2.5" per side. The stock front sub can go to a 275 x 18 with some careful wheel spacing and inner fender hammering (depending on ride height) so you shouldn't go larger in the rear than a 315 x 18 or you'll have understeer problems. Look for a balanced wheel, tire, & suspension package and try to get all your suspension from one manufacturer so it all works together.
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