Honda Prelude Radiator--Options?

Recored is what it says, you replace all the bit in the middle that normally leaks & reuse the endtanks that normally don't. Always worked well for me.

I had a radiator recored a few years back, no problems at all. In fact I took the radiator to the repair shop and they delivered it back to my house 3 hours later.

Unlikely - the Rover 600 was based on the next generation Accord, a 1989 model is too old.

There's unlikely to be /that/ much difference anyway pricewise, and if it doesn't fit then you're stuck with a 600 radiator and still have to buy a Honda one...

If it's a traditional copper rad, then re-coring is straightforward - the new core is simply soldered in place same as the original. And pressure tested afterwards. Indeed, it's sometimes possible the re-con uses a core made to a higher standard than the original.