I love batiks too! I like to see a variety of colors, variety of size/type prints. I really like some of the geometric prints. I often will opt for batiks if the quilt is for a man. It's easier for me to select more manly prints if I go with batiks (requires less effort anyway). If I peeked at my stash right now, I'd say 80% was some shade of blue! What I buy varies depending on what I make and who it's for.
I also love the Hoffman 1895 collection. Not really batik, handpaints I guess. They go well with the batiks and I seem to have some in just about every quilt I make.
The LQS in my area ranges in the $9-10 for batiks most of the time. I've bought them online for as little as $3.95. If I can get something I really like for under $7-8, I feel like I did well.
I have not yet picked up a pack of Bali Pops, but they are on my shopping list. It might be something to consider trying to gauge the batik interest by.