FYI, installing Windows 7 from an external hard drive can be problem ridden. You CAN however do it from a flash drive (which is much faster than the HDD anyway)
Just a little experience there, do what you're comfortable with of course.
The choices look fine, though if I may suggest a couple other brands here.
RAM - G.Skill offers products that are consistently the highest rated online, and they're inexpensive. ADATA is good, but I've had problems with their DDR in the past 6 months.
Toshiba is not a brand I equate with Trust. This is just opinion of course, but they still have a high failure rate where I work, and we don't like them at all. They usually fail within months, and I would hate to see it here. Other SSD brands worth checking out are Intel, Patriot and Corsair.
What kind of power supply are you using? If it's the one with that case, be careful - 60 watts isn't going to last very long at all. You're better off getting a MiniATX with a 300 watt unit than that case for longevity's sake. The SSD and RAM would be fine, but by the time you add the CPU & motherboard, 60 watts is pushing it pretty hard. Note that 60 watts in the case is a lot different than 60 watts from the wall outlet.