How many days do you normally go for, and what type of a budget I should be looking at, roughly?
The open pit lane days are normally a week day, so we try and get to the Touristfahrten the weekend before and sometimes have a day to kill playing on the autobahn in between that, and the actual organised day. So with 8 hrs drive there (inc Eurotunnel & all the faffing about that entails), then it's best to allow a day to get there and a day to get back. Some folks like to cane it and get up at 4am and drive the same day, but I like a fresh head to drive the Nordschleife.
Cost-wise, laps at Touristfahrten are around 22 Euros each, but this goes down if you use their new account system. You now get 15% discount for buying 200 Euros' worth for example. It's a great system though and you can keep tabs on the number of laps you have done, and what you've spent, all on the new iPhone/Android app
The open pit lane events themselves are around 5-600 quid. I always add training on top, so you get a qualified racing driver sitting next to you for an hour helping lines, braking points etc, and overall car balance through the many lumps and bumps that make the Nordschleife so brilliant. That's £100 or so.
Fuel-wise, getting there at a gentle motorway pace takes approx half a tank to get as far as the German border, then another half a tank for the last 140km just because the autobahn is so much fun
Once you get there, if you nail it she'll drink a whole tank in around 6 laps. That's just over 100 euros at Ed's petrol station currently.
Tyre and brake-wise, I munched through a set of Michelin PSS in 70 laps last year, and a set of standard brake pads. I now have the BMW M Race pads, and the wear and heat has not only reduced, but the braking force is HUGE, and the car handles better because of it. The tyres are around a grand a set, and the pads the same. That's over a whole year though, so I wouldn't worry about it for just a single trip. Wait til you get properly addicted before you start selling family members.
So you see it depends....!
This trip was bigger than usual, in both duration and number of laps, and with hotel, food and wine, it came in around £2200. I've done tourist-only weekends for a grands or so.
Hope that helps?