I am looking to get a heart rate monitor but unsure which to get. I do not want to spend a lot of money, so it will most likely be bought on ebay, or an online retailer. I have a cateye computer on my bicycle that does mph/cadence etc, so I do not need those things. The only problem is that I would most likely use it for running as well. I am not sure how uncomfortable the watch is while riding, or do they have mounts. Hopefully someone could recommend something good for me? I am looking at the polar s150 which can be picked up for around 80 but would like to spend around 50