I am looking for a bike computer, I have a cateye micro wireless, and always use my phone and upload data to endomondo. I'm going on a big ride and my phone will run out of battery before the end of the ride. So I need an actual bike computer. I'd prefer something that has a good web interface to look at rides. (Garmin especially), I've only been riding for a few months, And I've been thinking about the edge 200 or edge 500. I was wondering does the edge 500 come with cadence or do you have to get it seperate? And would the 500 be good for me so I can get trained on cadence? I have no idea what is good cadence. Also, is there any other GPS's that do exactly this for cheaper? Thankyou !

UPDATE: Does the Edge 500 get speeds from GPS or a sensor? I was wondering if i could get speeds on a bike trainer? do i need the cadence sensor for that?