Basically what Rob is telling you, very politely, is a sentiment many of the very experienced engineers here at CSC would. I'll be a little more succint:
8.0(x) is pretty much considered a poor choice unless there is a feature you must have (there usually is not). All of these versions are riddled with bugs...all bad enough that they were deferred by Cisco. If you have a CCO account, you can easily login and find out all the P1/P2 using the bug toolkit.
Now, a better option: Go to 7.1(3b)SU2 now and upgrade to 8.x later OR wait until a bit later this year and go directly to 8.5.
Although I have no direct experience with CM release quality, I have rated David's post above for its straightforwardness and practical value, something extremely important when the job is to bring solid and reliable solutions to customers.
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