You are correct about dip-switch settings being different between the CX2/3 and the MCX. I just got an MCX and I fly it with the CX2a (2.4ghz) transmitter. The CX2/3 dip switches are #6 & #7 up and #8 down. The MCX requires switch #6 & 7 down and #8 is UP. Simple enough, but the MCX Tx will not fly the CX2/3.

Remember that you are never stuck when you have a helicopter that you want to remove from the flightline. There's always someone out there looking for a good used helicopter. Ebay and RC Universe can both get it sold if that's what you want. I think that the MCX is ideal if your indoor flight area is congested.

$250? Hmmm. You cannot get into a premium helicopter for that price, BUT you can get a NEW Esky BELT CP and a Clearview Sim for the price. You'll need a controller but I think you can run the Sim with the Esky controller. An ESKY controller that feels just like the Belt CP transmitter and is USB can be had for about $30.

Personally, I advise getting the Esky controller here [link=https://www.ushobbysupply.com/advanced_search_result.php?keywords=esky+simulator &osCsid=921b7749bb6e46dc4cc67cbe0069bc4b&x=0&y= 0]SIM Controller[/link]. The $30 gets you a decent controller that is USB so you don't need a bunch of weird interface stuff. ClearView is not premium, but it works really well as a trainer. It certainly will meet your NEEDS. Would we all like a premium $300 sim? Of course, but it's all about priorities. A sim (ANY SIM) will save it's cost in broken parts.

About the BELT CP. I had one. It is not a premium piece, but it is far better than I expected. In the box you'll get a decent transmitter with variable pitch and throttle curve, a fully collective pitch helicopter, Lipo pack, charger, Brushless power, belt driven tail and a decent set of servos. About the servos - the gears are easily stripped, but the servos are rebuildable. A new gearset costs a whole dollar. Or you can upgrade the servos. I recommend that route because you'll be within your price point. If you stay in the hobby and want to move up sell the Belt CP. They sell very well on Ebay. Heck, look for a used Belt on ebay! A few guys on this forum have Belts so there is endless support if you have questions.

Good luck, Soloboss