Well the MR2 and the RX7 probably won’t be all that expensive. 
Which is good because the rest of 'em, you’re right, will nuke the bank account.
I had an '88 CRX with one of those. “Dual Point Fuel Injection,” it was called, and it was really more of a glorified carburetor than true injection. The higher-end model than the one I had used multi-point fuel injection, which put an injector into each cylinder’s intake, but mine had two injectors in a throat just below the throttle body. It was pretty common to swap from the DPFI to the MPFI system, which required an ECU swap as well as the TB/intake headers from the better car.