First, where are you flying out of? If you're anywhere near LA or NYC, then SQ's A345 would be suitable...even in economy class. Both Business and Economy classes have onboard "lounge" areas where you can walk and stand up. It's pretty spacious too. I can't speak for the other airlines, but I do love the A345 product. Timing is great too...get to Singapore in the morning for the connections to other cities. PM me if you need more info.