The Golden Boy 

First thought- if you like the bike and the way it rides- don't let the "mid-level" thing sway you. I shudder to think at how much money I threw at my Trek 400 Elance.

Second thought- That crankset is one of the very best triple cranksets ever- IMO it's a toss up between this and the Sugino AT. If you like having the granny, but not the half step- just get a 38 or so for the middle ring. If you want to do the wide range thing... you can take off the 28 and it looks like there is a 33 available for a 110 BCD. There's options- that's why the 110/74 was so dominant for so long.

Third thought- I'd get a different set of wheels, regardless. I did the 5 speed rear end to 10 speed rear end- and it was glorious. Like you said, there's no issue at all with putting a 130 in there. Now- I replaced the middle chainring- and did 10 speed- but the one issue I had is the chain sticking between the granny and the middle ring. It's happened twice in the past 4 years or so.

If'n it were me, I'd replace the middle chainring to a 38, get an Ultegra 10 speed wheel set, an Ultegra 6603 RD, (and 6600 FD* if you need to be all matchy-matchy), Dura Ace 7800 bar end shifters. I'm not entirely sure what I'd do about the bars and brake levers... the Belleri touring bars are nice, but I like them wider at the brake levers... and something makes me say you need aero levers with a 10 speed setup. I mean, you don't... but you do.

* Don't get a modern triple FD unless you're using it with matching shifters and crankset. It won't shift right.