Personally, I would save it for rims. That's just about the only thing left that I'm going to do to the outside of my truck. At least until I decide whether or not I'm going to keep it when my lease is up.
BTW, I'd also buy those CobraR's I've been wanting and some tires with $1000. I really need tires now since I got another flat the other day. Riding around now on the spare till I get it fixed Saturday.
I personally know that the boss 306's will look really tough on your truck as I have them on mine. But I know of myself and I think a few others that I think have these rims. If I were you I would go to a rims website and take a look around. There are some pretty awesome looking packages around. Good luck. Rims are definately the first mod to do. They clean a truck up like night compared to day.
I think i would try and come up with a coil/over shock-strut lift kit for the 3 rd generation Ex's since there is none on the market! There are a lot of people just waiting to lift up the 3 rd generations and no-one has one on the market!
I'd get the rims also. But the spinners comment, I dunno there's a 4 door XLT 2nd Gen Red around here that has some 20 inch spinnners looks pretty good also a 3rd gen 4 door xls red with some huge spinners dont know the size just saw him one day. i think it depends on the look you are goin for with your X if spinners would look good or not. Just My Opinion.