Well, the 6-puck will break your tranny if you're not careful, so stay away from that one. The 4 puck is going to be pain for everyday driving. I say that if you're going to hit 300 within a year, then maybe go with the 4-puck, but I'd stick to the street disc personally. Think about it realistically. 300 is a great goal, but are you really going to get there? I'm not saying you aren't, but it is a lot of work. Not only that, but when you get up to about 250, you might find that your really happy with that. Remember, you drive a really light car. 2640 pounds if i'm not mistaken. But yeah, if you think you're going to definately hit 300 within a year or so, then think about the 4-puck, otherwise stick with the street disc.
Hope that helped <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>