Yeah, check out that link.
I put a Pioneer 2DIN in (can't remember the model though) and had the steering wheel controls done up with the PAC module. Controls volume and skips songs, however doesn't work perfectly with presets (will tune normally through each station), but if I hold it down it will cycle throw presets, but really fast so you have to be quick to let off.
Don't think I spent more than $500 on everything, including installation. I can do the HU myself, but didn't want to mess with the PAC module and potentially messing something up there.