For the price, I don't think you will be disappointed, but if you think you will be looking for 'the best', I would suggest either waiting for the 3a sigs or better yet, a pair of Treo's or Quatro's.
True, they are more expensive, but I though I was never going to have 'upgraditis', and ended up selling my 3a sigs and getting Treo's. I should have listened to Mr V. and just gotten a pair of Quatro's and been done with it.
Incorporating a sub (or a pair) is one of the best upgrades for the 1,2, or 3's.
Bob