newbie questions : accesories

hi all,
I?m in the middle of getting an ultra, either 6400 or e4xt
I?ve been offered an e6400 naked, ie no option boards installed... I?d like to add ADAT I/O, maybe even an FX board. Is the ASCII option a good one ?
Are these still available anywhere ? Or just here and there on ebay ?
Would you recommend an RFX or invest the same money in some used outboard, like DP4 etc ?
I?m in the middle of getting an ultra, either 6400 or e4xt
I?ve been offered an e6400 naked, ie no option boards installed... I?d like to add ADAT I/O, maybe even an FX board. Is the ASCII option a good one ?
Are these still available anywhere ? Or just here and there on ebay ?
Would you recommend an RFX or invest the same money in some used outboard, like DP4 etc ?