Since this is my first foray into 4-strokes it's a tough choice. The guys at my local club are hip on YS and Saito for 4-strokes (OS for 2-strokes). You're right about the price; they're all within about $20 of each other.

I've read some posts about pumped engines causing problems w/cracked fuel tanks. Is this prevalent or a fluke occurence? Easily solved with a more elastic/higher quality tank? Is a cline regulator a type of pump? Is the YS "supercharger" also a type of pump? After this, no more dumb questions.....thanks!