If you're resistant to building (like me), go and get one of the Morris ARFs. Sure they're a tad heavier, but your 46 should be adequate for 3D. I had a Morris the Knife ARF with an MVVS 40 and it was a GREAT setup, learned how to hover, flat spin, etc. with it. I now have a Topcap ARF with an MVVS 49 and it will hover at 1/2 throttle (then again the engine spins an APC 12x4 at 15,000 rpm).

Sure you may save 1/2 a lb building, but I had my Topcap ready to fly in less than 4 hours worth of work.