I'm another that loves sampler type quilts. I've signed up for a BOW one that is done by the designer that did the 365 Block a Day challenge.
I've found as I progress in my quilting, I'm purchasing more patterns as I'm attracted to ones that would be very time consuming to figure out on my own, and they don't seem to be the type that you find for free very often. I still do plenty ones that I find free or are simple enough to figure out.
I really like equilter for what they have, but it's more suitable for panels, or they are a repetitive pattern.
I've done the Sylvia's Bridal sampler, and bought Dear Jane and Nearly Insane but have not started them. Many of Jen Kingwell designs are in the nature of samplers and I find them very fun to do (don't like her colors though).