HT Receiver advice or look at newer integrated?

Looking to upgrade to for my son. He is a current Soph in college. Just moved into his house, but all equipment will be in his room. My goal is to help him build something that will serve him well for years to come, until he can upgrade on his dime. All his current equipment has been purchased used over the last year or so.

Current setup is NAD 3155, emotiva speaker cables, blue jean cables, B&W 685's (front) and Monitor Audio BR2's (rear). B&W center (unused at this time) as he has now way of running it.

Our current dilema, is what HT receiver to purchase. Or do we consider integrateds like he currently has, just newer with more options to expand. He uses his computer/ipod only currently. I do see him wanting to run his TV/DVD player in the near future. Reason for my post is to ask for some advice from the experts.

Have read quite a bit here, and have researched receivers such as Arcam AVR280, NAD t747, Rotel RSX-1050. Just options that people seem to be happy with. Not brand loyal, just want the best bang for the buck. Are we on the right track? Would like to stay under $450 and have no issue with a used receiver.

Thank you in advance for you input.