i too was in a similar situation , having bought a planet t5 system a few years ago , unfortunatly with each model having different settings i was facing a challenge , either upgrade to something a little more expensive or buy multiple txs , one for each boat ( my main hobby is boats , but ive also got 3 cars ) i initially bought a planet twister , believing the sales info of the set having 8 model memory only to find that four of those are helicopter only memories , earlier this year following several brown outs at our local pond i sold all of the planet gear and bought myself a spektrum dx6i , as the name sugests its a six channel set , it also boasts adjustable end points and travel as well as servo reverse etc , it also has a TEN model memory and a system that prevents you powering up your model while in the wrong model memory , most of my models use the orange aftermarket receivers which can be bought for around a tenner each .