The two amps you are considering are very different beasts, although both are excellent units. Because the two amps will produce quite different results in your system, you really should audition both in your home before making a purchase.
I think the more relevant point, however, is whether to upgrade your current speakers first. As regular readers of this forum know (maybe all too well), I'm a long-time fan of Vandersteen speakers. Hence, it may seem out of character to suggest that you ought to replace your Vandy 2CE's before you buy either of the two power amps. Here's my reasoning:
Both the VTL and Parasound amps are capable of significantly better performance than you will hear through the 2CE's, so I suggest you consider upgrading your speakers first. If you like your Vandies, then move up to the 3A Signatures, which are a much better speaker than the 2CE Sig's (particularly if you add a pair of 2Wq subs), or maybe even look for a used pair of Vandy Model 5's (which would sing with either of the two amps you're thinking about).
I think the more relevant point, however, is whether to upgrade your current speakers first. As regular readers of this forum know (maybe all too well), I'm a long-time fan of Vandersteen speakers. Hence, it may seem out of character to suggest that you ought to replace your Vandy 2CE's before you buy either of the two power amps. Here's my reasoning:
Both the VTL and Parasound amps are capable of significantly better performance than you will hear through the 2CE's, so I suggest you consider upgrading your speakers first. If you like your Vandies, then move up to the 3A Signatures, which are a much better speaker than the 2CE Sig's (particularly if you add a pair of 2Wq subs), or maybe even look for a used pair of Vandy Model 5's (which would sing with either of the two amps you're thinking about).