I have a quite old racing bike that I was going to dramatically update by having the dropouts spread, respraying bike, adding mod groupset and new wheels. Then came the credit crunch. Ah well ... new plan. I`m doing nowt save getting new ( much lighter ) wheels. Should there be any issues with this ? The cassette is Shimano 600 ( which morphed into Ultegra ).
The most important problem is: which group will you use? Remember that the groupset decides the freewheel -> the rear cassette -> the rear hub -> the wheelset.
Why don't you buy a decent group (9-10 speed) and a "more recreational" pair of wheels (Vento? Fulcrum R5 evolution?)
Zonda 2008 are *great* wheels with record-class hubs.....!