Should I get a Samsung Galaxy S2 in 2013?

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I decided to get a Nokia Lumia 900 on a sim contract for 2 years in late March and I really dislike it and want to sell it and purchase a new phone but while using the same sim. The lumia lacks in so many areas, there are hardly any lock screen notifications, the apps are terrible and there's not a lot of customisation(something they try to say that they have).

I don't have a lot of money and I was wondering if the SII was worth buying, I can get a new one for around £170 on eBay.

The things I'm looking for in a phone is good apps(good games and good social apps(like facebook, twitter, instagram, whatsapp, snapchat etc.)), lock screen notifications and a bit of customisation. Is it similar to the S3? I have heard that the S3 isn't too good in comparison to the S2.

Any information would be useful,

Thank You