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You want to keep the underlayment and it should be running perpendicular to your sub floor. You want to put felt paper on top of that before laying your hardwood floor. I manufacture hardwood flooring, but if you want to do it another way more power to you.
Why do this? Well, for starters... your floor joist run 1 way. The subfloor runs perpendicular to the floor joist. the underlayment will run parallel to the floor joist. when you run your flooring, you run perpendicular to the floor joists. this creates a crossing of the floor and underlying sub floors. Everything is tight and reduces squeaking. the underlayment ensures a flat, clean surface. the felt paper further reduces squeaking. Also, make damn sure you rack your floor tight or it'll look like shit in no time. Also, make sure you snap lines from room to room off of high visual areas and run off those, don't run off one side and go to the other.
Anyhow, hope it helps, have fun.
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