RC31's came in 420mm or 440mm long forks (Dropout to crown race) - a 93 Merlin will have been designed for 395mm forks. Thats not to say they cannot be used just that the geometry will be altered blah blah blah.
Black Ritchey Logic forks would probably be the ideal match.
For something a bit different and superlight how about some Cannondale Pepperonis's?
Orange had a stock of 1" forks a few years ago and may still have some - I seem to remember they were after about £30 for them in any stock colour - probably worth fireing off an email if your tempted.
Ti Groovy's would be awesome if Rody builds them and you have the cash.