Views creation help needed - signup node title selection

I've created a custom "who's coming" view (see screenshot) - that was based on either the admin-list or vbo-admin-list view (can't remember which I started with) - anyway, wanted to provide users ONE place/page to see sign-ups to ALL/ANY current (active) event.

I've accomplished this, but not in a very "cool" way - especially when there are MULTIPLE active signup (w/ uc-signup) enabled nodes. I'd like the exposed filter of signup enabled node titles to be a drop-down selection list, rather than the textbox I've got now. Without entering an event title, the view defaults to all signups to all events, which, as I say, is quite a cumbersome list if there are many events going on at the same time.

Any way to do this? -Thanks in advance
D6.19
views - 2.11
ubercart - 2.x-dev-(@6-5-2010)
signup - 1.x-dev-(@11-22-2009) w/ patches
uc_signup - 1.x-dev-(@7-27-2010) w/ patches