Which tyre sizes for track - square? staggered?

[funtime]

Evening all,

Not quite back in a CSL yet - but wont be too long hopefully... anyway in the meantime I've just picked up an e46 M3 and want to get on track.

Question is.. what set up works best on track? I need to buy tyres and I don't mind selling what I have to buy some more options, but i'll outline my ideas below.

I'll be buying Michelin Pilot Super Sports which ever option I go for as I loved them on my CSL!

Option 1)
BBS CH 19x9.5" ET35 Front with 265/30/19
BBS CH 19x10" ET20 Rear with 265/30/19

Option 2)
OEM CSL wheels with standard size tyres (235 front 265 rear)

Option 3)
M3 9" Rears all round with 265/40/18 front and rear

What do you think guys? does anyone find that running a square set up makes the rear end more lively?

Thanks in advance, hope you're all well!

James