What are the best pan gaskets these days ?

what kind of oil are you using?
synthetic oil is more likely to leak. it lubes better but will find a way to escape your engine faster...
also if you dont have a proper evac system it can apply a little pressure from the inside.

get the oil pan off and make sure the pan rails are straight

if you use a new cork gasket, dont overtighten it as it will start leaking

also dont apply a bunch of RTV it makes the gasket slide while you are tightening it

mopar performance has black fibrous type gaskets you can get them from summit or other places. they have a 1 piece or a 2 piece (if you use windage tray)
http://chucker54.stores.yahoo.net/oilpangaskets.html

i think mancini uses USPS for shipping