David Millar is quite against disc brakes and may have a strong point.
A pity the page looks like a car ad but there are some interesting bits:
http://road.cc/content/feature/149577-david-millar-changing-technology-pro-peloton-and-whether-disc-brakes-have

I understand that the small tire patch can't handle the full stopping power of the brake.
But I still think the combination of both more power and a smaller diameter will offer much more modularity before blocking the wheel.

The only problem I got with CB pedals, is I had to sand paper the grips of my shoes sole, where the axle touches the sole.
The grips were a little to high compared to the cleats, and made the pedal hard to engage.

For the trails, you can give a look at http://viewranger.com
You can import GPX routes, and follow them on the map while riding.
And it can record your ride, with a GPX format too.
Maps(OpenStreetMap) can be downloaded on the phone for offline use and save battery.

And if you need to go on a road from a point A to B, with classical turn by turn, you can use Google Map.
But this may drain the battery quicker.

If you live in Europe, a laced wheel fall in an anti-dumping category, and you may get a 48.5% importation tax.
While if you import just the rims, you get the usual 4%.

Here is another piste to consider...

I tried few rides with my iphone attached on the stem inside a cheap waterproof case.
Using a software called viewranger.com

My plan now as it works quite well, is to find a chinese rugged android phone.
And use it as my nav device.

It should cost 150€ or so.
OpenStreetMap and OpenCycle map are quite good.
But for about 15-20€/year you can get a subscription to the very precise army maps here in some European countries.
The maps can even be stored on the phone.

Just outside of Bristol, England

Our roads in summer:
 

Our roads in winter:
 

SamSkjord, I'm reacting a month later to your pictures.
And didn't want to hijack the "where do you live?" post

Bristol looks much like Belgium, but worse

Do you ride the whole year?
Do you clean your bike each time?
Do you have to change bearings(other parts?) regularly?

Are there any others who ride in the wet too(cold or warm)?
How do you cope with it?

I would try all of this:
Either guide it with fingers, from the bottom hatch you seem to have.

Or may be there are some holes in the BB (like the 256) that helps guide it at the top of the BB.
Or maybe there is an inner hose (like the 057?).

You can as well, first use a steel cable inside, guiding it with a magnet, it works quite well.
And then attach the hose to that cable and pull it inside the frame.

Or if nothing works, contact the vendor to know how it is supposed to work.

I don't clean it too much or pressure wash, but ride in rather harsh conditions during the winter.

My BB was closed, a simple waterproof aluminium tube with two profiled end for the bearings.
Water and mud were getting in anyway.
Definitely through the shaft/bearing interface or the bearing seals.

I drilled two holes through bottom the hatch and BB, and now when removing the crank arm, it is generally clean and dry.
The bearings still doesn't last long, but longer than without holes.