well there are only three main areas for mods: power, handling and looks. You can get some crossovers, but not too many. My first suggestion to anyone is get some swaybars and endlinks. They really help in the corners, with almost no sacrifice to ride quality. I'll add a 4th category: durability/longevity. Things like an oil pickup, mudflaps and maybe some gauges fall into there.
Let us know what you're thinking, and we can give some suggestions. Start up a member's journal, its a great place to get feedback, start wish-lists, etc.