Hi everybody:

I have been reading a lot of things about this nice device. I want to buy one for two main reasons:
1- I have internet in my bed.
2- I want a GPS

This last point is crucial to buy it. But I have read a lot of bad things about GPS. My question is:
If I buy a BT GPS device, Can I solve 100% the problem about the wait time for signal in the Nokia N810?

The N810 is a great device that also has a gps.
I bought it because it is a great device, and as such it is good. If I had needed a GPS I would have been disappointed. The GPS is quite good when you want to go for a walk and track where you have been. It isn't very good if you want to use it in your car to go from place to place. It also isn't very good if you are in a hurry to get a satellite signal. If you get an external bluetooth GPS, then the time to acquire a signal depends on that. However, the gps software is still not as good as other things.
I would say though, if you want a GPS for routing in the car, get one of the cheap ones going around at the moment, or get a tomtom or the like, they will be cheaper than the extra cost over the 810 you have to pay to get routing (and a decent GPS receiver). They are many times better at that.
If you want the internet in your pocket (or pajamas), the nokia 810 is good at that.

I have to confess browsing the web from bed since buying my N810 a few days back. Got an elbow in the ribs for doing so by the boss, so won't be doing it often :-)

Maybe you should just stop sleeping with your boss?

No can do. She owns half the business, the house, the money, ... :-)