You have picked some nice planes and most of them shouldn't be a problem for you. Having said that let me say that all "second type planes" are much more responsive than your trainer and will fly faster and turn quicker than you expect. I don't really see what the big deal is about a low wing for a second plane. If you have good stick time behind you then this only takes 1 flight to get used to. For the first flight on any of these I would try and buddy box for a flight or 2. The intitial response rate may scare you for a few seconds until you realize that it actually makes the plane easier to fly than your trainer, then you be set and having a ball. The Taylor craft looks cool but isn't much different from your trainer performance wise. The space walker is pretty laid back also. The fun 51 can be a handfull for a low time pilot. I would leave this for a 3d type plane. The super sportster or the rv-4 are both nice. I would go with the Super Sporster. IT will fly really fast at full throttle, is aerobatic, and will land as slow as your trainer. A Carl Goldberg Tiger is also high on my 2nd plane list. IF you get in trouble, just remember that the plane will not drop like a brick if you throttle down. If things get crazy, just slow it down for a while until your nerves settle and then throttle up a bit. Hope this helps, Fast!