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spend slightly over £100 and get the garmin 110, this is the first watch I used and it's great value for money!
Spend £136 and get one of these (hopefully this doesn't reignite the 'bezel' thing again; they work fine if used properly).
www.hrm-reviews.com displays a good range of heart rate monitors all broken down in to activities or brands. All link to Amazon where you can buy with your own account.
The Garmin Forerunners have built in GPS which really helps as you can also see how far you have run not just how fast.
Some of the Polar and Suunto watches can be used with a foot pod to record distance, but they are usually an extra. You could go for one of these as a cheaper option and upgrade later, if you feel you want to know distance as well.
I put 'er Indoors 205 on a popular auction site last night, and was surprised to see people selling them for £160 upwards. One seller was even selling one with a heart rate strap!
Lizzie, the Forerunner 10 doesn't need and in fact can't work with a footpod or heart rate monitor. If you think you might want to add these abilities in the future, then you'd need to go up the Garmin range to the 110 for the HRM and to at least the 210 for footpod capability as well. I pulled the details of Garmin's running watch range onto one page - it took a bit of scratching around: