35 Summilux vs. 50 Noctilux?

[Stieglitz]

I have the high-class problem of deciding what lens to get for M8 given Leica's special offer for those who pruchased in 2006.

Currently I have the new Elmarit 28/2.8 ASPH and the Summicron 75/2 ASPH. To my thinking, the best choice would be something inbetween and also something faster --especially for me who likes available light photography.

But which of these two would you recommend and why? I'm thinking of the 35/1.4 ASPH or the Noctilux 50/1.0

Here's my quick rundown of what I perceive to be the relative merits, which makes me totally indecisive:

1. Summilux 35 --better (in fact incredible) optics and smaller but possibly too close to the 28 (a 50 is more inbetween)

2. Noctilux 50 --bragging rights with blinding speed and interesting effects due to shallow depth of field, etc. but some optical problems (vignetting etc,) compared to the 35, can be difficult to focus due to shallow DOF, bulky to the point of being un-Leica-like

Any other thoughts? The "deal" on the Noctilux is especially attractive for what can be a special purpose, almost cult lens. But aside from all the debates about it generally, which should I get?

Thanks in advance for any opinions or advice.