Anyone know if it's possible to have two price groups (retail, wholesale) as well as quantity pricing for each group? Example:

Retail group (no login):
1 qty - base price (no discount) of $50
2-5 qty - 10% discount
6+ qty - 15% discount

Wholesale group (member login):
1 qty - 10% discount
2-5 qty - 10% discount
6+ qty - 15% discount

Not sure if it matters, but I'm using ZC 1.5.1.