Well I've never been disappointed with an Interweave Knits mag, so pick 5 and you're good to go! But here's two patterns that I really like...
Spring 07 has Eunny Jang's entrelac socks. Totally fun to knit! I'm working on a pair right now.
Fall 05 has the felted getaway satchel... amazing mary poppins looking bag. Quite a project, but would be totally worth it. It's on my very long to-do list.
The must-have for me was Winter '05 with the Embossed leaves socks... but look at all the photos they have up of the patterns inside and decide if you think it's worth buying! At the checkout there was no mention of the free 5th issue... that's just included automatically right?