Looking for a new Phone

I use the Nokia 5100 phone currently, but got spoilt after using the Treo600 ( I was developing on it for a client). Now, I find the 5100 highly inadequate. However, the current crop of phones don't really come up to the mark. Can you suggest something ?

My requirements :

• PIM functionality
• Easy to type ( I do a lot of SMS and also will need it to enter the data).
• FM Radio ( the treo600 does not have it , so I can't buy it).
  
• Easy fit into the pocket ( I ride on my motorcycle quite a lot. Need something which can fit easily into a jeans pocket).

Can you recommend something?