I bought a Merkur safety razor which took ages to get used to 
pm Vonmessa he knows all about straight razors and you need to go with one, face oils mixtures etc.
There is a thread on the forum about them, i am seriously thinking of getting a straight razor as the Merkur safety razor is better then the cartridge type.
I've been using one for a couple of years now, I've got all the stuff and know how to use it. If you're doing well with the shavette, you'll like the actual straights. It's a slightly different technique, as far as blade angle and such, but the actual straights will be a lot smoother shave than the shavette is.
If you buy a new one, be sure and have it professionally honed, by a guy who does razors, not a knife sharpner guy, they think they know how to sharpen razors, but they don't. The difference is night and day. If you're in the UK, I can recommend Neil Miller
http://www.strop-shop.co.uk/ He's a really great dude and super knowledgeable and puts a great edge on a razor.