Welcome to head-fi
Sorry about your wallet.
I don't know where you live, but ask in this thread if someone around your area can change the jack.
Contact this guy, he can recable the whole thing, even add detachable cables.
Or ask the guy from headphone lounge too.
Fixing the jack should not affect or improve sound quality (unless its very cheap) The Vsonic are well praised around here because of their performance/price ratio, You should stick with them, and fix the jack although should be interesting see detachable cables on those...