Try going with the s3 and if you don't like it you can return it within 2 weeks for an iPhone 5. This is exactly what i did. I tried the s3 for 2 weeks. I liked it but liked my iPhone better so i traded it back for the iPhone 5. The keyboard was the biggest thing that i couldn't get used to lol. I tried downloading other ones but it just felt too different. Im extremely happy with my iPhone. It does everything i need it to. S3 is a great phone too though so i say give it a shot. My friend had an iPhone 4 too and upgraded to the s3 and loves it. Total opposite of me.
may have to try this. do you have verizon? is this something all phone companies let you do?