Hey guys, need to get a new memory card as I'm going for a 2 weeks trip. Looking at a 64gb sd card. Currently in the dilemma between sandisk extreme sdxc 45 or 85mb. Price for both of the cards @ 64gb capacity are 78.90 and 111 respectively. Or cant it be cheaper? Im using a eos550d btw so would i gain any benefits from having the faster card. Thanks alot.