Yeah, I suppose they are ok, but for the vcore (1.45) I see many people with much better temps. If I go to 4ghz (which was my original goal for 24/7 use) the vcore is so high the temps get out of control quickly.
I think you'll need another single rad in there, or find away to go with a triple rad. I have the MCR320 cooling an X6800, 680i north bridge, and an 8800GTX and my temps are not great. If you will be doing no overclocking then you should be fine.
I went with a t-line on my first water cooled build, then went with a res on the second build. If I could do it all over again I would have gone with a res from the start. The bleed time is reduced to minutes instead of hours (12-24+). Go with a res!