Re-tubing Audiomat Arpege. Suggestions?

I just recently bought an Audiomat Arpege (not the reference) which came with Electroharmonix 12ax7's and Mutine EL34's. I would like to experiment with tubes and would like suggestions from others. I did a search here and will do a general search on audioasylum for the EL34's but wondered if there are other Arpege owners who have found their favorites.

Thanks,

Stuart