I started out with a 510 back in December 2009, but in June (or was it May?!) 2010, I purchased an eGo...and so far I can safely say now that it was perhaps the next best thing since I bought myself a 510 starter kit. The others are pretty much the same as an eGo, though I do not know the exact estimate cost for them. The VaporTalk Store does have some eGos on stock, I believe, but if you're more interested in the Riva, Tornado, ect., it never hurts to look around. If you check on where there is the list of suppliers in the main forum, they're bound to have the right electronic cigarette for you on stock.
My eGo
^ This link here should give you an idea what the eGo looks like, though it would be shorter and not have the "whistle tip" mouthpiece like mine does. Mine has a mega battery and a eGo atomizer, so I deeply apologize for providing a picture that is different from what a standard eGo would look like. They do come in different colors rather than just my black one. I do hope this was helpful for you.