I love my f-50 head and 3/4 back 1x12 cab... lots of bang for the buck and probably my fave mesa ever. so much sound and tone from a little cab...
I cant speak on the combo, but I would think the combo to be a bit shallow sounding compared to a head cab rig. maybe thats a good thing?
as for value....do your home work, they are all over the net and vary greatly in pricing....