If you're running high capacity, multi cell lipos, the 50 watt output of the 0606i will limit your charge rate and make charging take a longer. If you're running smaller capacity, 2S, then the 0606i's 50 watt limit won't be a prob.
0610iNet is an awesome charger - I been using one for a little over a yr with a 25amp supply. I run 5s a123s and it will charge them at 10amps in about 15min! The 0606i would only be able to charge them at around 3amps due to its 50watt limit.
0610iNet is being replaced by the 0720iNet charger which will be the same basic charger, but has a discharge feature the 0610i does not have. Thats the reason 0610i seems to be cheap - they're basically on sale in front ot the arrival if the new 0720iNet.
No question in my mind - for that price diff even if I had to buy a PS, I'd go with the 0610iNet. I've been thinking about a 2nd one to network charge with.