I would only offer, if youre still undecided, that I personally would get the glass... It's shelf-life is longer, and give your current glass, either of those choices pushes you into other styles of shooting... I'd go with the wide-angle, i love forcing myself to shoot with it and expanding my style...
Expand your shooting repertoire with different glass, get some new and energizing shots in the can... the 30d is still a great camera and you can do a lot with it.
Basically a new body means you will still be limited to your current shooting situations/styles but the images will be better quality...
New glass means you still have the same limitations in quality, but you'll be able to shoot way more styles of photos, now and for years to come...
Just my 2 cents... Your millage may vary.