Running watches

Hi,

I have just completed my first half marathon and need to start building the training up for an off road half marthon in September as well as a Marthon at the beginning of next year. As a "slow runner" I would like to buy a running watch to help me with my interval training, to build better stamina which in turn will increase my pace! I would like to get a watch that I can see my pace as I am running as well as my distance.  As I am pretty new to this I dont want to pay over the odds for something that I might put back in the box (depending how the marathon goes! ) 

I was looking at the Garmin forerunner 10 and the forerunner 110?  Can anyone give me advice or recommend a good product.  Thanks