The War with Sippy Cups

I really am at war with sippy cups. I can't find a dang one that is truly "leak proof". We have tried several brands, some work great at first, then leak after a month of use, and some leak right from the get go. So far we've tried:
Nuby Soft Spout 

These were the first ones we tried. Jackson started using them at the end of last summer, just for water. When we switched to homo milk, this is what he used. They were awesome in the beginning, the soft spout is a great transition from the bottle. After about a month of continuous use (we had 3) they all started to leak. I think the built in valve in the spout wears out. They were fairly inexpensive so i wasn't too worried.

Avent Magic Cup

                                             

I tried this one next, it also has a soft spout. It says no leak, and i assumed by the name MAGIC that maybe it would work. No such luck. It actually leaked through the air hole from the very first use. I called the company, and they don't warranty their products, but they did send me 2 new spouts. The new spouts, leaked too.
Nuby Hard Spout

This is the next one we tried. So far it doesn't spill, or leak at all. However, the spill-proof ness of it releys on a plastic piece that attaches to the underside of the lid. When Jackson is done drinking, he generally throws his cup, and i don't always catch it in time. The plastic valve comes off, floating in the cup, and milk leaks everywhere. Yes i know he shouldn't throw his cup, but he's 13months old.

Avent Toddler Spout

We received these cups as a gift. They are slightly different than the other magic cup. One of them doesn't leak, one does. I don't really know what the problem is there? I'm not going to buy another one, and hope i get a good one.

Kerplunk Kids

This cup was also a gift, and leaks through the air hole. It has the same spout as the magic cup. I do like that it is stainless steel, so we use it for water.

Gerber Graduates Cool Twisties

I don't know if this one leaks, he won't use a straw. Maybe when he figures out the whole straw thing we can try this out.

So fellow moms, do you have a recommendation for a good sippy cup that doesn't leak, spill, drip etc? (at this stage we need a larger cup 8-10 ozs)

I'm really over cleaning little milk drips up from everywhere. Although, Jackson does LOVE to smear his spilled milk all over the floor!