For you? Definetaly the tascam
It has a control surface (the weak point of your setup is the behringer board, you could get rid of that with the tascam)
It has great mic-pre's (again a million times better than the behringer)
It has good converters (probably a little better than the 828, maybe a db or two)
It has everything the 828 has PLUS a motorized control surface with fast access buttons
I got a mackie control universal (a similar control surface to the tascam but without the interface) and it has really helped me do things faster and easier. ALOT less writers cramp from using that dayum mouse all the time! And it is made to be used mainly with cubase (your main listed program of choice) I think it even comes with cubase actually.
DEFINATELY go with the tascam! (just my opinion)