The planes posted are not real gasser planes..
Dont bother with wasting your time going with 26 and 46 cc gas frames
Get it right and purchase a real 50cc motor such as DA/3W/Taurus/BME etc,there are some seemingly good Chinese motors,but time will tell if they are any good after extensive running.
Airframes are best chosen from Extreme Flight/BME-PAU/Wildhare,SD,Aeroworks,Comp ARF/Airwild,QQ etc.
There are some other good combos I forgot to mention.
Nobody can tell you what to get and how to do it.Its best to really start watching forums and builds.There is alot to be learned from that.If you are going to buy 4 or more gas planes than you must have money to buy the best equipment
If you are 3D oriented than I would not even look at that Pitts with a G62.Also consider noise at your club.If its regulated to be under the recomended DB,you need to pick and airframe that supports canisters and also be able to spend the money on the exhaust system.You need metal gear servos,good digital ones,they cost about a 80-100$ and up each.Dont skimp on them.