Nothing that you have right now. The only useful sequencer I can think of that's under $80 is Renoise, which is actually very capable but will be terribly confusing for you [it even boggles me sometimes], if you're used to stuff like Finale Printmusic or Anvil Studio [which are terrible, unless you actually need Finale to print sheet music].
If you can go up to $100 or even $150, FL Studio is a bargain. There are different bundles for FL though:
http://www.flstudio.com/documents/SUB_75.html
That shows the difference between packages. Here's some advice: if you don't know what it is, you don't need it yet. You can always upgrade later.
I'm assuming you already have a few soundfonts. FL Studio can load any midis you've made previously, and you have the option to replace your midi channels with soundfonts. Once you have a DAW like FL Studio, Sonar, or Cubase [or maybe something else], you can just forget about making .mid files altogether, and just compose right in the software.
I'm afraid if you want a truly realistic sound you are out of luck, or at least a few hundred bucks. If you check the ReMixing board there are threads you can look in for some samples or names of things to buy.