Hi Spastik,
I would say just about any ball would work out fine for a beginner. I personally would recommend a bowling ball that doesn't hook very much so that you can actually learn to hook it the right way. Then later on as you develop, you can try some of the bigger hooking equipment and will be able to hook it as much as you ever need to.
Any of the entry level bowling balls like Roto Grip's Sonic line (Sonic X, Sonic X solid, Sonic Boom, and Super Sonic) would be a good start. I'm so behind on what's new out there now, but I know every company has an entry level line of bowling balls that usually costs $130 or less, so you should probably start there.
Make sure to get a finger tip grip, and hopefully you can find a few good bowlers to watch and learn how to hook the ball from them. If you can stay away from the hook-in-a-box type of equipment early, then it should benefit you down the road.
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Brian
MichiganBowling.com
http://www.MichiganBowling.comFamous Last Words of a Pot Bowler--"Ok, but this is my last game!"