Aftermarket units are a pain in the arse, in my opinion. Especially when you have a special consideration like steering wheel controls. Go to
www.replacementradios.com and check out their factory original radios for your vehicle. Click on the Radios category and drill down from there.
And contrary to information implied here and numerous other places, the Monsoon head unit isn't any better than the regular 7 band EQ head unit (UP3). It was the rest of the Monsoon system that made it better. They perform the same without it and you probably don't want to undertake swapping the whole system out. But... you can use the Monsoon head unit if the 'cool' logo is worth the extra money to you...