Xbox360 Core System Question ?

I'm thinking about buying a 360 but I can only afford the core system and I no it doesn't have enough memory but can you save your progress in games

By the time you buy the memory card, and in all honesty you'll want the HD, it's the same

Just save your money longer.

Youch, is the difference really $160US in the UK?

Is there a UK equiv of Craigslist? I've seen premiums on there for as low as $320US slightly used