Highly recommend the Garmin ones for bike computers...ok pricey, but if you shop around for a NOH (Garmin speak for it being as new but really a refurb with full warranty) version, but do come with huge discounts. So gives a lot more data (sadly no ones tied it and a BG meter together (yet) though) for your rides like heart, cadence, climbs, calories burned etc. And you know what us D's are like for data hehe.
Been looking at the Shimano's myself at the moment. Currently use the 4 way entry smaller versions than the single sided, but am probably going that way when I finish building NF.
Enjoy the rides :)