Hey there Strider,
I had no idea two handed bowling would be such a big topic in this forum, but since I've joined, seems like there is definitely a mass interest in it. Yeah, first off, definitely don't expect to make the switch and automatically come out of the blocks firing, it will definitely take some hours and games of practice, so don't get frusterated getting started.
I was a pretty solid one handed bowler, avg. right around 200 never above 210, just couldn't peak that breakthrough to take it to the next level. Was playing with the two handed style for over 15 years and kind of used it as a B game for deep inside cause I never could put enough hand into it one handed. Once I committed to making the change after a great outing at Nationals 4 years ago, I practiced like a madman to get through the learning curve of incorporating this new A game. It has since improved my avg. to over 230 and definitely has gotten me through that breakthrough.
Most of your speed will come from your timing and momentum from your legs, not so much from a lighter ball although you will be able to sling it harder, but then you'll be sacrificing being comfortable with your current weight and tend to put less into the ball. Stick with a ball weight you are comfortable with not so much with how fast you think you can get it down the lane.
Hope this helps a little bit.
--------------------
Justin StevensThe Hawaiian 2-Handed Phenom.

2009 Hickam West/Northwest Regional Champion
Avg.: 239
www.StevensVIEW.comMy Arsenal:Track 930T
Hammer Hot Sauce
Hammer Black Widow Bite
Storm Fast & Furious
Hammer Onyx Vibe
Storm Ice Storm
YouTube Links:http://www.youtube.com/watch?v=8MslBO5jo6Qhttp://www.youtube.com/watch?v=OhgsZF697E8http://www.youtube.com/watch?v=Gwti_SwV-hw