We use the munchkin ones that have a straw that can close and open. We LOVE it and it's really cheap, we paid $2.24 each at Target, they will be in baskets on the bottom.
We used standard zippy cups at first but DD never liked the flip up straw cups. We went straight to cups with straw and caps (they are called Take and Toss...super cheap and really great. They have them at Walmart) DD loved those! Only down fall is they aren't totally leak proof. We have also been using these cups from Sassy that each the LO how to drink from a regular cup. These ones are spill proof and super cool! Our DD has been able to drink from a small regular cup by herself since 15 months (with supervision of course though because she loves to play in water lol)
Re: sippy cup/straw cup
I really prefer the First Years sippy and the munchkin flip top straws.