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This one is the top-rated silicone case for the iPhone 4. it's really thin, isnt too grippy but provides enough grip so it doesnt feel slippery without collecting lint, has good impact protection including the front due to a lip around the screen, and comes in multiple colors and designs.

link to iPhone4 ultimate silicone case
 
link dont work for me. not sure if its for everyone or just me, but my search NEVER works. Ever.

o yeah belkin cases are a nice silicone. check em out. so are the magpul series if you like that look. Extremely sturdy and feels great (looks great in my opinion too).
 
also i read that the front of the iphone is not gorilla glass i was wondering if i would need a screen protector and if this is a little more prone to scratches.
 
there are some nice clear gel bumpers on the web if you search for them. The clear one looks especially good on a white iphone.
 
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