Zach, nice job on meeting your time. I read your detailed report...
Glad to hear that you took an H20 bottle with you on the ride. You should really be consuming a few ounces every 15 minutes. I've found that transitions often include runs of up to 1/4 mile so you should try to factor that in. I recall when I did the Palm Springs tri in April you mentioned that I should speed up my transitions but the time included a 1/8 mile run so I thought I was OK
As for your 1/2 IM on June 5th...wow. It seems that you and I are pretty close with respect to fitness levels, I would probably even say that I'm a bit ahead of you at this point...I personally don't think I could complete a 1/2 IM yet. I wouldn't have any problem with the swim and the bike (those are standard workouts for me every week) but I could not complete the run. My feet hurt very badly after the 10K in the Int'l Tri in April to the point that I had trouble walking for the next 24 hours.
I don't want to discourage you but I also don't want you to injure yourself to the point that you will get set back from your goals. I have my sights set on a half IM on June 5, 2006 and I think I will need a good part of that year to get ready for it.
Whatever you decide, I'm sure all of us on the board are pulling for you. Use your best judgement.