I have seen a couple of threads about the Aresti and some folks are having trouble with the quality of the ARF- Seems to be some structural concerns....(Just as many people say theirs is just fine though..) I would just give it a good once-over if you get one-
Are you considering any other planes or just the Aresti? You want it for 3D also?
Alot of people seem to like the Venus for beginner pattern and SOME 3D stuff- Remember it is a compromise if you want both...The U-Can-Do "can do" some of each also-
I have the Zen-50 and YS-63 and it is a perfect combo- (for pattern that is

)
Good luck and have fun!