Valley Bike & Ski is awesome
Hampshire Bike Exchange is also great. Go check them both out and see which one you like better - they both have a different feel to them.
If you wind up in Holyoke at all (10-15 minutes away depending where you live in Noho), Highland Hardware & Bike is one of best shops in the area.
I'd advise against Northampton Bicycle and Competitive Edge. While I'm sure some will disagree, my experiences with this two shops have not been very good.
You'll find awesome road and mountainbiking all over the place!