I might be a little bias since the op is looking at my 7 right now that I have up for sale. I have driven stock 240's and a 240 with coilovers and a sr20 swap. The 240 may not always be a cheaper solution a sr swap costs just about the same as a turbo rotary swap and a turbo rotary will make more power than a sr20 will make because at some point that sr is going to need rods and pistons.

the biggest difference as stated was that the rx7 is a much more luxurious car over all. Its a much smooth and solid drive over a 240.

Granted parts are easier to find for a 240 and you don't have to go re learning a whole new engine setup.

And to plug my own car, my main focus while I have had the car is making sure mechanically the car is in awesome shape...I keep getting asked why I am selling since the car is running awesome.

Ohhh and one big downside to the rx7...a 240sx will never be as loud as a na rotary lol.