I'd say two things... If you really think you are ready for it, go for the Venus. It is a great flying plane. Your other option might be excellent as well, I've personally have no experience with it. You can't beat great planes though for quality hardware, excellent instructions and amazing customer support.

Go with one of the OS engines. You'd even do just fine with a .61, .75 or .91 2-stroke in the Venus. On the 4-stroke side, there is nothing wrong with YS's. In fact they run EXCELLENT form what I have seen. I do see a lot of guys fighting them sometimes though. As GrayBeard pointed out, the YS nuances could be learned of course but the OS's will be friendlier if you don't want to take on the additional challenge. One of these days I'll find a plane for my .81FS-a.

RCKen also has a good point about 4-strokes getting damaged easily. I have never seen one coe through a crash well, including one of mine... It is hard to see in this picture but the intake pipe is broken and so is the cylinder head. All of that stuff hanging off can be a problem in an impact.