Gadget Help. Anyone want to shop or make suggestions?

[woowoo]

I'm trying to figure out the best gadget(s) to buy to accomplish what I need to accomplish.  Here is what I need (want?):

1.  A bike computer that will track cadence, speed, etc.  Should be effective on a trainer as well as on the road.  I would prefer it to not be very expensive, or easily detachable because I live in the city and often have to lock my bike in public places when doing brick workouts and people here are assholes and will steal the computer.
2.  A heart rate monitor
3.  A GPS watch that is waterproof.  I don't necessarily need it to track my swimming but it would be nice if it did, I just want to be able to wear it in the water without a problem.  Would obviously need to have the heart rate monitor in it to solve #2.

I've been looking at this kit:

www.amazon.com/Garmin-Forerunner-GPS-Enabled-Monitor-Triathlon/dp/B009NN6S60/ref=sr_1_1?ie=UTF8&qid=1388505267&sr=8-1&keywords=garmin+triathlon+910xt

Which would solve everything I need but it's expensive and would SUCK if I lost it.  Would it be better to buy 1 & 2/3 separately?  Do you have suggestions for those? 

Thanks everyone!

[joenali]

There's the 310xt. That might be cheaper.