Where in Germany are you? You might even have a track somewhere close by...
Might actually be worth keeping in mind that the distribution rights for Losi have gone to Robitronic this year and that they are concentrating more on the RTR/Monster Truck/Petrol cars.
I drive a B4 and it is the easiest car I've ever had for maintenance, parts availability and I like the way it drives a lot. If you really are never going to race it you could also have a look at the Thunder Tiger AT10 (I think...) It's basically an Associated B3 with Metric screws. Drives fine and is strong.
I wouldn't go for the Losi because it really is becoming rare in Germany after the team basically disbanded. A lot of the guys who used to run Losi are now driving X-6's and RB5's. From what I've seen up to now the RB5 is a great car with lots of potential but a crap gearbox (compared to a B4)
PM me in German if you need any more help.