(Sorry, Peale - can't wait 'til 2nd week of June - thanks for the warning that your stock was running low, though!)
Thinking about just getting the Quick Disconnects from GroovyGameGear, but don't know which ones to get:
Connectors
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Female Quick Disconnects .187" - $1.99
Quantity:  25 pcs
These can be used with the Omni-Stik(tm)for simple hookups.         
Female Quick Disconnects .187" - Blue - $3.49
Quantity:  50 pcs
These can be used with the Omni-Stik(tm)for simple hookups.        
Female Quick Disconnects .25 - $1.99
Quantity:  25 pcs
These can be used with our pushbuttons for simple hookups.        
Female Quick Disconnects .25 - $3.49
Quantity:  50 pcs
These can be used with our pushbuttons for simple hookups.   
Female Quick Disconnects .187" - Red - $1.99
Quantity:  25 pcs
These can be used with the Omni-Stik(tm)for simple hookups.        
Female Quick Disconnects .187" - Red - $3.49
Quantity:  50 pcs
These can be used with the Omni-Stik(tm)for simple hookups.        
Female Quick Disconnects .25" - Red - $1.99
Quantity:  25 pcs
These can be used with our pushbuttons for simple hookups.     
Female Quick Disconnects .25 - $3.49
Quantity:  50 pcs
These can be used with our pushbuttons for simple hookups.
http://www.groovygamegear.com/cgi/surfshop/shop.cgi?ud=UkpEVFNOM0lYRSUlJSUlJTEwODYwOTEwMDUA&storeid=1&c=search.htm&categories=0023This is what I'm thinking of buying:
$34.95 OmniStik "Prodigy"
$13.50 OmniStik "Basic" 
$13.50 Mounting Bracket
$34.95 KeyWiz Max 
$16.68 Pushbuttons (12 @ $1.39)
$  3.58 P1/P2 Pushbuttons (2 @ $1.79 ea)
$  1.39 (Yellow button for coin)
$  8.95 Shipping (US Priority mail, insured)
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$127.50