If you go with the NRS get the E-Series. The lack of seam tape always concerned me and I just had a friend tell me his fleet of Otters is having a seem leak problem, just out of warranty. NRS is great love my E-series rafts, just like the Hyside Rio Bravos you get what you pay for when you downgrade. On the other hand, bought a few Tributary's from Aire this summer as well, way solid for being their cheap line and their customer service was good for the one boat I had a problem with.You should try to demo the Aire & NRS-E they will handle way different, go with the one that you feel better in they are both great boats.
By the way all you Avon lovers, have you tried their newer boats with hypalon tubes/ PVC floor, don't it will make you sad.