i assume RSL no.5 isn't better than RSL no.4 so i would say don't go with anything under RSL no.4. for the price, RSL no.4 is pretty durable, even tho it is a bit fast.
definitely training grade/lower club level grade. I have some for sale on my online store. How would I describe it...erm...OK shuttle. last maybe 3/4 if you drop a lot, 1/2 for normal combo and less than that for constant/heavy smashing game. Steaming help only a little... and for your little competition make sure each side provide their own, or say you provide a limited # of feather. http://www.freewebs.com/badmintonessentials/badmintonessential.htm