Reply to Help with Audio Interface PLEASE!

Hey guys,

To make thing short and easy:

My setup:
2x CDJ 850
DJM 850
Kontrol X1
Traktor 2.5

Im extremely broke at the moment and found a pair of CDJ 400's lying around, I want to connect them to Traktor for decks C and D and I am wondering which Interface to buy:

Audio 8/10 DJ (the expensive one)
ESI Gigaport HD+ (the cheap solution)

Which one do you recommend?

My question to the Audio 8/10 is...once connected to Traktor, do the CDJ's work same as on USB HID mode?
do you still need mappings?
can you connect CDJ 1000's?
what happens without mappings for them?
Do you see things such as the pitch fade (when moved on the CDJ) moving on Traktor?

Sorry about all the questions, but I hope someone can give me some help!

nico