I use the EDGE card myself personally its my favourite card and I've tested a few I have not had a single problem with my EDGE card and its updated constantly, its fully compatible with all of the latest games and its UI is the easiest I've seen on a flashcart. The EDGE card is also very customizable in terms of skins you and there easy to switch aswell.
I bought mine for $20 which is around £11 from dealextreme its cheaper there now bout $17 I think but it doesn't come with a micro sd but they are cheap to buy anyways.
I vouch for the EDGE card and would happily recommend it to anyone and everyone