Thanks, all for confirming what I suspected all along. When my boss first suggested getting a new bike, my reaction was that since I'm nowhere near winning my age class and am only competing against myself, can't I do that just as well on my old bike? The only reason I could see getting something newer would be if it would make a huge difference, and it won't. So here's what I'm going to do:

Ride the 610.
Get some clip on aerobars
Investigate some better tires. I'm still on 27 inch wheels, so I'll be limited in what I can get.
Possibly replace the rear derailleur, as I think the original one may be getting tired.

Equipment wise, that's it, unless I find that I need more gears after I test ride the course, which I'll do shortly after the race date is set.

Training wise, my wife and I are going to start a round of Power 90 next week. That will improve my overall strength and flexibility. It will also get me down to 150 lbs, which is as light as I should ever be. (I'm 5' 11"). Some time this winter, get some swim coaching. Also, I've got to work on my running shoe setup. After the sprint tri this year, I did some running and found that I had some more speed available, but that using it made my knees hurt. I have terribly flat feet, so I'm looking into some more aggressive orthotics. I'm also going to add a training regime to try to add some speed to both the ride and the run. I may be able to pick up the pace on the swim a little, but am mostly concerned about getting out of the water in good shape. At the sprint tri, there were a bunch of guys who went out too fast on the swim and got out of the water so tired that I caught them on the run from the beach to the transition area. I'm not going to make that mistake.

Oh yeah, two months before the race, eliminate all sugar, refined carbohydrates and alcohol from my diet. Nutrition counts.