Locks that work

Hey, I'm live nearby Frankfurt, Germany.

I'm really not sure about which locks I should buy. My first choice was a Krypto Fahg, but I think it's too small for my old road frame.
My other choices are the Abus Extreme 59 u-lock, the Kryptonite New York M18 and Abus Granit X54.

The X54 is the cheapest, but it's secure though and a lightweight compared to the Extreme 59 and the Krypto M18. The Abus Extreme 59 is very expensive otherwise it'd already be mine. So the M18 seems to be my choice? But which second lock should I buy? Any ideas?

Might i ask what kind of secondary lock you are looking for? Do you plan on leaving the M18 at the rack? And are now looking for a lighter secondary lock for carrying around?

Both the M18 and Extreme 59 are large, very heavy and very awkward to carry. Fine for leaving on site. But i wouldn't want to carry even one of those, not to mention a second lock on top of that...

Personally, i think the X54 is the best compromise of strenght and portability. With the Fahg and NY-lock in close pursuit.