Yamaha DTXpress/DTXplorer/DTXtreme

hi just bought the dtxpress brain for my custom drum kit, its sounds 
great but i really want to know is what the best soundcard to use to 
record the drums to cubase or cool edit? 

and what is the best way to record  the dtxpress i.e line in midi?

When i record via line in the drumms sound very tinny and the cymbals 
very disorted and awful, should i record in midi?

can some please tell me what i exactly need to record good sounding 
drums to my pc


thanks