If you're looking for a CMP rifle, Service Grade will give you a pretty decent & function one - but read and understand the description - unless you're exceptionally lucky, you're not going to get one that's pristine; you're going to get one that meets the criteria. (I've got two Service Grades - one slightly surpasses SG criteria, the other is somewhat better, so I have no cause for complaint. But neither is the nearly-collector-grade rifle that some lucky dogs get - they're both post WWII mixmasters.)
If I were looking for only one rifle today, and was going to use it as a shooter, I'd probably go for one of the CMP's Special Grade rifles with new barrel, stock, etc.