GOOD QUALITY FOR 400 PHOTOS.? I make photos with my mobile phone and save them on my PC laptop. I need a backup device, considering a 4GB memory stick - PRO DUO with USB. I need good, long lasting quality for 300 photos. I want to view them full screen on a PC. Would you recommend a 4GB for £7.50? Someone said a 4GB is $45.00. On Amazon I saw a 4GB for £7.50. I would appreciate correct advice. Thank you.