An interesting find Simplex: have you dealt with them?
No address, no phone number, no prices?
Some of the product details are wide of the mark: apparently the Chorus chainset was the same from 1991 to 2000 and Record front derailer [sic] the same from 1992 to 2000.
I'd need some reassurance before handing over my hard-earned with no more than an e-mail address with a Hungarian domain to go on.