Here's three pretty difficult challenge caches for everybody from juicepig:
http://www.geocaching.com/seek/cache_details.aspx?wp=GC3H7V1
http://www.geocaching.com/seek/cache_details.aspx?wp=GC3H7V3
http://www.geocaching.com/seek/cache_details.aspx?wp=GC3H7X6
For Level 1 we need two which we can get during Spring Fling this year.
For Level 2 we need four....possibly finish this summer.
For Level 3....."forget about it"
You can perform your own "my finds" search in GSAK by:
Search - Filter - Arc/Poly & then change the N44 W79 as required.


