Also of mention is a ring-light where you have virtually no shadows with only one light. Though they leave a hideous unnatural catchlight... in my opinion anyway.
You have a lovely site digitalfrog and a strong portfolio, though I feel out of consideration for other form members you should have a nsfw (not safe for work) warning near your link. Even though all your nudes are done in a pleasing and tasteful manner.
I would recommend you play around with natural light before diving into the world of flash. A few helpful items would be a large diffusion panel and silver/white reflectors. Flash can be an expensive venture and you should do a large amount of research before investing in any particular equipment.
Though if you feel you're ready I would recommend alien bee's when starting out. They are more powerful, cheaper and produce a better quality of lights than the canon speedlights are capable of. Check out: www.alienbees.com