I've been into 240's for about a decade now... owned 4 or 5 of em.
KA is a pretty good motor for a daily driver, and with intake/header/catback it will shut down your average intake/exhaust civic or other FWD.
They are dirt cheap... DIRT cheap. anyone who bitches about the drift tax is lazy. I bought my last one, a full rolling shell missing only engine and transmission, for $150 with minor body damage. The one before that was complete (thought it turned out to have a cracked head) and a convertible and I scored it for $650 and made about half of that back selling the good automatic, harness, ECU, and motor.
The other two were solid drivers and I didn't pay more than $2000 for each of them.
at any rate, they are plenty cheap for what you get. They are very safe cars to crash in, they are very simple, lots of room to work on everything, very serviceable, parts are insanely cheap and they arguably have as good an aftermarket as the civic or mustang. They are overengineered in everyway, with a drivetrain that will easily take 400 hp without flinching. There are kits to swap in just about every motor worth swapping... RB series, 1jz/2jz, ls1, lt1, 305, 302, 350, VQ series, VG series, its all been done.
I think they are great cars and I hope I find myself in a situation where I can build another one eventually. I think I'd like to build one for rally.