I couldn't agree more with AlanII and BeBerlin.

Buy a good quality brush, a couple of really great soaps and/or cremes (maybe both), an SRD strop that is high quality and can be easily repaired with replacement leather or replacement fabric WHEN (not if) you make a mistake and damage it, and buy 2 or 3 good solid vintage razors from the classifieds.

IMO, The very very best of new razors are as good as a well honed vintage in good condition, but in terms of the shave they'll give, not any better. There are MANY $50-$75 vintage razors right now that would be every bit as good as a new razor that cost 3 times as much, if not better, and buying them would let you try a couple of different razors, and spend more money on the accessories that make using a straight more enjoyable.