I have a Beyonwiz PVR too but finding it difficult to record stuff without IceTV - just too fiddly.
Aside - Out of principle, I refuse to pay for IceTV anymore, after they went bust, took my balance with them & increased prices - I had been a 6+ year subscriber otherwise.
I use Plex a lot too - with a Mac Mini Server.
Have thought about the HD Home Run / Plex combo myself and looks interesting.
Any idea on:
1) How to store recorded FTA stuff - do you have to point it to a NAS/HDD - or does it come built in?
2) What about remote record and series linking and TV Guide (i.e. what Ice TV was doing) capability?