Disclaimer: I've had no experience with any of these hosts, my comments below are merely my speculation:
That being said:
Melitaweb.net - Nice plans from the consumer's perspective. One wonders if they can operate profitably with those resources allocated for those prices.
Milescape.com - Nice domain. Nice plans from a consumer's point of view. They have a forum with a small user base which means they are somewhat established.
iisnet-networks.com - Again, nice plans from the End User's point of view, their forums do appear to be lacking in members, however. This could mean two things: 1) They are a fairly new company. 2) They have been around awhile and have just added the forums to their already existing service.
From a glance I would go with Milescape. Their forums show that they communicate with their end users and is a good selling point.