Looking for a Vita that I can take on flights and have fun in hotel rooms. I am looking on ebay/craigslist and want to know what I should look for. Obviously I want to be able to run backups. I don't want to have to lug anything around except the charger and the device itself. Is an 8gb card enough? Or should I splurge for the 16gb? Will both the slim and the original work? Do I have to make sure it's below 3.6 firmware? Anything else I need to know before I start looking? Any general advice for pricing?