I'm looking at getting a new mobile that has a spotify app.

Around £75 second-hand as i want to trade in my Blackberry Curve 8520 at CEX

It also needs to have gmail app, fm radio and wifi

I understand the Nokia 5230 is worth a look. any other suggestions?

Thanks

you need a premium a/c to use it on a mobile device. At least Symbian and iphone apps exist, though not even the iphone 4 has FM radio (you can stream, though).

Android also has a spotify app

I have a premium account. I was thinking of another Sony Ericsson or this Nokia 5230. It also needs to be good at surfing the internet.

How much is Android likely to be?

Android is a google OS for phones basically, there are several different handsets which use it.