Its not impossible bud... but if you want a snow sure large ski area, its a bit of an ask.
Bulgaria Borovets is a nice enough notive, intermediates resort.
As are most of the places in Andorra like Soldeu.
Lavinio in Italy is also pretty good.
They have a fairly good range of runs and have a cheap night life. And are cheap to get there and stay.
For a huge Ski area.
Your £600 if you take out 6 days riding pass at a more premier resort, you are left with pretty much £400 for flights, transfer and board. That is before the over priced food and drink.
I would recommend the following.
Les Arcs in France.
Stay at a Hostel, I only ever stay at
www.loftbourg.com/ amazing place.
Buy all your food at the supermarket
Fly there and get transfer with Coolbus
www.thecoolbus.co.uk/Your looking at having paid about £170 to get there
Its 195 Euros for the week stay.
6 days lift pass is 263 Euros.
Budget 10 Euros a day for lunch or take a packed one.
Live off the Lidl Supermarket opposite the Loft, which is so cheap it will make you cry when you get home.
Party with all the Lofties every night.
That is probably the cheapest you will get a week at a decent French resort.
You wont be staying in Resort but its 5mins chair lift into the resort and has cheap beer and wine in the super markets.
In Les Arc 1800 you are looking 4-5euros a beer and shots ouch...
In Bourg St Maruice you are looking 1-3euros for a bottle of very easy to drink wine or a crate of beer.
I did a season there couple years back and spent 6 weeks there last year after I got back from my season in Utah.
Great mix of runs, the snow is usually pretty good. Even in bad years it holds the snow really well and its currently dumping out there.
Best resort personally for me in Europe is Avoriaz but that is a costly place to go play. With the port du soleil pass its a huge crazy area of fun :)
Alternately.. Look out for last minute catered chalet deals. If you can get one of them you are set... but they are around £700-1000 at the mo for decent large area resorts..
I am sure people will be able to find you cheaper places than I know but I tend to follow the snow and the runs.... I have been to some smaller resorts and been bored silly of them in a couple of days
Keep ESF out of the park