I was very, very torn between Last Exile and Blue Seed, but in the end I went with Blue Seed. I adore that series so much, and so few people have even heard of it, so I had to spread the love a little. Last Exile is incredible and I definitely recommend it as well, however.

I'm also a huge fan of Slayers, but the TV series mainly. The OVAs are good and I enjoyed them, but the TV series is much better in my opinion, especially Next (the second season). Hopefully you'll have your Season 1 box eventually! ^^;