If this is your 2nd airplane, and there should be a good probability of that as you're posting in the Beginners Forum, I'll bet you're not planning to do much 3D or such with the sucker.

Most of the 60size ARFs I've done in the last few years have been about 7.5 pounds ready to fuel. For a learning pilot, having a thumper pulling up front won't do you any favors. Contrary to popular belief, fatal crashes are almost never avoided with a burst of power. As a beginner, you actually are better off not having more power than recommended.

I've been flying a Tiger60 and a Sukhoi31 for the last year with sort of a musical chair engine swap going on. They've had 61FXs awhile and 75AXs awhile, not necessarily in any order or pattern. Your choice of 70/75 engines for the Zero should give you a decently powered model that you'll develop some more skills with.

The Zero is a cool looking model in the air. I'd bring my 50size P40 out if we flew at fields that were closer together. The 60size F4U would be a good choice too.