Jason and Dogphish have great points....decide what your gonna put in first. You can go with a mini-fridge that will allow you to keep it indoors and can actually be a decorative part of your house or you can go with a converted fridge or freezer...I actually have both a fridge and freezer that are converted...I started with a freezer conversion and I absolutely love it because I can have 6 kegs going at the same time...but eventually I realized that the only thing missing from my perfect beer was a frosty mug, so I converted a fridge as well and now I have 8 kegs going and probably should check in to some sort of rehab!!!!
So my advice (looking back) is start out with a fridge conversion...small for in the house or large for the garage and frosty mugs. Refrigerators as Jason pointed out are cheap on craigslist (I got mine for $100)...after you decide this part, then decide (based on space/needs) what equipment works best for you...also dont forget you may want to re-use yeast or make your own slants, so you might need space for that as well.