Read quite a bit on these and I am still on the fence. Between the ego and riva I think I'm leaning towards the riva for cost reasons as well as the button. I definitly don't want to go near the ego tank system until it gets much improved. And if riva, se or not? Or is there another cost effective peice (really dont want to go over $50 after shipping, but can go up to ego price) that you'd recommend over both? I'm basically looking for a pv that I can drip with at home, but uses carts, and has battery life that last me my day. I go through 2 standard 801 batteries on work days. Thanks for any help.