Is your rent going up rapidly as well? If so, you might want to add that as a consideration for buying just to protect yourself from future rent increases.
It's hard to give general advice about this. If you plan on staying there for 5-7 years (or so), and won't be in the hole a lot after paying the buying fees and the selling fees if you need to sell (i.e. there's not a huge fall in prices when you want/need to sell), then buying often makes sense. As others point out, you need to consider how much of the interest and taxes you can deduct.
If you have a conventional loan, your home falling in value is only an issue if 1) you want to sell, or 2) you want to get money out of the house in an equity loan. If you can't imagine moving nor selling, it's not something to worry about terribly much, IMO. I don't know for sure what would be the ramification if you have an adjustable mortgage, but I don't think it would be different.
In order to make the comparison you've got to consider all the factors. Renting isn't cheap either.
Remember - Location, location, location. And beware of Condos - they can be difficult to sell.
HTH.
Cheers,
Scott.