you could go back to school & work at the university while you're there. Generally, the IT Departments at universities are pretty big and they give you a good idea of anything you're going to encounter. At my university when someone shows initiative and they're competent and not a douche they pretty much always get the chance to prove themselves - ymmv, but I get the impression that quite a few universities are like this.
If you get on as a student, that's cool, part time, focus on school, show some initiative and try to get a full time job
If you get on as a full timer - awesome for you - most universities offer pretty good benefits, a lot of them include stuff like tuition wavers (full or partial - either way, you're going to end up paying less.)
and finally, working at a university IT department doesn't necessarily mean being in a support role -
our it department has an application development group, a services group (support), a project management group, a system administration/network admin group, a business group that handles contracts & such with other departments/companies, a research computing group (super computers), a dedicated security group, an administration group (payroll), and an HR group. Of those, sysadmins, services, and app devs have to do support. Everyone else is only rarely customer facing. The likelihood that you're going to get into the non-support groups right away is pretty slim, but movement has a tendency to be really fluid.
In case you didn't get the main point of this - the important thing is showing initiative. Show that you're interested in doing something new and interesting - show it by talking to people who do it already and trying to shadow them. Work with your bosses to get involved in projects, do things to get noticed. =)