Thanks folks.
I went ahead and booked 3 RT Biz Tickets using 96 A+ Credits transferred from my WN RR account. I'll keep watching to see if Coach availability opens up and rebook whatever I can.
I am currently Airtran Elite which I matched from WN last year. I just checked and it expires before my trip so I'll have to call and get it extended, although if I am travelling in Biz Class on a Reward ticket, I am not so sure it matters.