Which F1 race to attend?

[OpenToSuggestions]

Hey all.
Me and a friend want to attend an F1 race this year.
It must be in Europe and it must not be expensive.

With these requirements in mind, what ballpark figure would a weekend at the races cost? Is it possible for <£500?

 

[OpenToSuggestions]

I think I'd like to make a weekend of it.

Here are my thoughts so far:
Silverstone - Cheapest 'weekend out' overall but the ticket prices are poor and the weather is questionable.
Turkey - Heard it is cheaper to fly there, watch F1, fly home than it is to go to Silverstone. No 2014 race.
Spanish - Don't know much about it.
Austrian - Don't know much about it.
German - Don't know much about it.
Belgian - Awesome track. Could be driven to.
Russian - Is in Sochi, so as close as Russia gets to the UK.
Italian - Love to one day, but way out my price range.

 

[OpenToSuggestions]

A trip to Spa is doable for £250pp, but don't expect much change (if any)!

That the all-in cost?

Do tell how it can be done .