I'm looking for opinions on the best module for creating a form with the following specs:

Intuitive interface for a relative novice to work with.

Stable

Capable of handling a form with approx. 10 fields

Capable of handling 100k+ records of the above

Searchable in all fields

Customizable results display

Capable of having records entered by multiple users simultaneously

Capable of having records searched by multiple users simultaneously

Capable of exporting records to multiple formats

I've been looking at Form Master, H2O, XMod, Enterprise for this but find they all have their strengths and weaknesses.  Most use XML, but H2O seems to create its own tables.  This could be good or bad.  Form Master seems straightforward and easy to use but can it handle the load?  To that end can any of them?  Which is the fastest or uses the least resources so I don't get booted off the server? 

Anyone with experience with any of these or willing to offer your opinion is encouraged to respond as I'm at a loss over which one is best. 

Many Thanks!