I have a 3 but ordered a new 32gb Verizon. I don't know why, lol. A faster processor will be nice and I love the new Lightening adapter on my iPhone 5 and new iPod Nano.
The 3 is fine and I never had a problem with the wireless or found it sluggish in any way. 30mps at home and a little less at work. If you ask me, Apple just tweaks the wifi hardware so people will have an excuse to buy a new one. "Oh yea, I want better wifi."