Newer boxes than the IPN330HD?

I have a IPH8005 which works great but my 2 x IPN330HD boxes are very slow. I would say the remote works about 70% of the time. When navigating ondemand its almost unusable. Are there newer boxes than the IPN330HD? I have the 45M/U450 package. They are wired via coax but CAT5e is an option with some work invested.