I do a very small amount of racing (local club races) so the extra weight of the triple is not an issue to me. The benefits of the lower gear ratios (especially if you ride in a hilly or mountainous area) far out weigh (no pun intended) the weight penalty.

I rode the Bear Tooth Highway last weekend (70 miles starting out at 6000' and climbing to 11,000 followed by a fast run down to 4700'!) and the triple was an absolute must! My brother rode it with a double and a 12/25 and was very jealous of my spinning up the passes.

If you think you might like the triple I'd go for it.