different sources - MPEG2 wide and dv 4:3

Ok, replay time...

Client handed me DV 4:3 from Camera one, and camera 2 was Sony with Card.
I got the MPEG2 files moved to the edit system, then also realized they are wide screen.

I understand MPEG2 is already compressed, etc...

Destination is DVD.

I have MPEG screenclip, so my main question:

What are my "best" options on output from streamclip to go INTO FCP?
A) Screensize
B) CODEC

A) Should I use streamclip to smush it to 4:3 before import to FCP?

B) I saw FCP uncompressed 4:2:2 as an output options, also MP4, etc,etc. Or should I convert it to DV before import to FCP?

Thanks in advance!!

--Joel

iMac family,

G4 - iMac, eMac, mini, core duo macBook, and Intel iMac.