Guys, thanks for all the input, but I'm afraid I was wasting your time. The guys I work with have given me a little more guidance than I though they would. After talking to them more and finding out about a planned addition to the R/C field, I've decided on what I'm going to start with. Now it's just a matter of which one and when I'm going to get it.
When I've gone out to the track watched them run I've been more interested in the 1/5 scale rigs. The biggest thing I didn't like was that they were too big for the track. Looking at some track design stuff, it appears to be a 1/10 scale track they were running on. This week they started building a new dirt track designed for 1/5 scale. From what I've been told it should be completed in a few weeks to a month. The field owner is also interested in hosting some events if there is a big enough 1/5 scale showing. Sounds pretty interesting to me, I think I'm going to get in on this.
As for the chosen vehicle... It's going to be a clone, not one of the "name brands". The guys I work with have steered me towards a King Motor RC (from kingmotorrc.com). They are a Chinese knockoff of HPI, and they are compatible with HPI parts. It'll be 1/5 scale (if I haven't said that enough), 2wd, and powered by a 30.5cc "fuelie" motor (fuel/oil like a weed-eater or chainsaw). I haven't really decided between a buggy or SC truck, but I'm leaning heavily towards the buggy. I've shown the one I'm thinking about to a few of the coworkers and they seem to think it is a good starting point and has a lot of the earlier upgrades that would be needed (mostly stronger suspension components). Best part is that the price is coming in at just under $700. Only a couple hundred more than I'd get into a good 1/10 scale nitro for and the fuel costs a lot less. Right now I'm just waiting on a little info and making sure of which one I want.
As for expense, honestly I could go buy a reman 4.0L for my Ranger tomorrow. Then I could turn right around and drop the $1600 of a 1/5 scale, fully built, RTR, 4wd Short Course truck, and it wouldn't hurt the pocket that much to do it. I don't want to do that, it ain't as much fun to me. I enjoy working on stuff when I can and have the place. I enjoy building things, breaking them, and rebuilding them. I enjoy buying something new, tearing it apart to see how it works, and putting it back together. I'm just stupid like that. So forgive me for wanting a gas engine that needs to be worked on and adjusted, forgive me for preferring to start with a $700 2wd clone that's going to need working on. It's just how I do things.