iPhone 3Gs or 4 16gb or 32gb WANTED in London, Essex for sale

I'm looking for a iPhone good condition no cracks etc. boxed with charger... ( if you can't please tell me), I dont want any iPhones which are cracked especially the 3GS models at the charger area. I'm swapping for an iPod touch 8Gb 4th Generation worth around £130-£150ish there are no scratches on the screen an I can 100% guarantee that the back however has scuff and scratches. It's just for the iPod- I've misplaced the box unfortunately. If for an iPhone 3GS/4 I might swap my mobile also which is a Samsung GT-B7300 Omnia Lite with Windows Operating system- it is great condition with only the slighests of scratches on the back ... It will be fully boxed with all contents it's worth £140 from play.com. If any queries please reply to ad. Thanks for reading.