$500? You can buy a new set of 225/60/16 easily for only $400, and you're still less than $500 installed. Buy them at Walmart.com, it's cheaper than other places, they deliver to your local store in a day or two, then take them to a good tire shop for installation. That's what I did with my Cooper CS5, and they've been great for me (and American made, too!). You can even get a set of lower-end all-seasons for $300, and you're less than $400 installed. If you're only keeping the car for a year or two, you could buy good used tires for $300 installed.
But anyway, post pictures after you buy your tires, so we can see how the larger tires fit.