Kuryakyn used to have a product called the Full Dresser bag but I think it's discontinued (and it's more "low tech" than these new bags also), but the XW 1.5 roller bag fills the same niche. Should have more storage than the Saddlemen bag, although the roll bag on top of it probably equalizes things pretty well.
This Saddlemen bag is new to me though (as you said in that other thread, there is a huge assortment out there to pick from) and looks really good also. More classic leather and buckles, less spage-age formed synthetic pockets.
I'd love to get one of these Kuryakyns for this summer but between LED conversions, new seat, Ricor Intinimators I'm going to try in the front forks and so on I'm running low on cash if I want to have vacation money too! Everything costs at least 25% more to get here to Europe what with shippings and customs duties so it adds up.
XKürsion® XW1.5 | Roller Bags | Luggage, Organizers and Storage Covers | Kuryakyn
Honestly though, I don't see the need for a smaller bag at all. The same bag packed with less stuff works fine, a small bag or a big bag still use up the luggage rack.