I've had a Humax 9200 for ages and it's been great. I wouldn't entertain getting a single channel PVR. Sometimes get some good deals on refurbished Humax stuff directly from them HERE
I've just installed a foxsat box for my father in law and am very impressed. Get some HD content and get benefit of iPlayer (other on demand services coming later in the year) if you are hooked up to internet.
Alternative is to wait for the decent Freeview HD boxes to come along.