I currently play Mame games with a Ozstick ultimate (two player 7 button per player layout with sanwa sticks, nice and compact) and 21" computer monitor. I am quite happy, but I quess I could always be happier

So I have been thinking of buying a Slikstik classic controller (I really want a trackball and a spinner and the 4-way joystick is also a nice addition), 27" D9200 monitor and building a cab for them. Some questions:
1. I am mostly interested in fast paced action games like robotron, bombjack, dodonpachi etc. Is a 27" monitor too big for them? What I mean is that I suppose that with a bigger monitor I have to move my eyes more around the playfield, and this could possibly make the game harder because I cant see all the bullets etc. without moving my eyes. Am I completely wrong here?
2. Do any of you Slikstik owners play Robotron? Any problems? The reason I ask this is because I think the joysticks in slikstik are quite far apart.
3. Has anyone used the new metallic SS-competition handles (ball top) yet. I really like how they look, but how do they work in games?