We're going to be flying Airtran. I actually hesitated when I found the flights becuase I thought they were high. We normally go in January for around $115-$130. I am so glad now that I booked, prices right now are anywhere from $100 more to twice as much!!
We've flown SW before but I really like Airtran cause the seat config is 2 and 3 across the aisle. DH and I like to sit in a 2 seat row.