Hm, not really sure why you would want guide...he hits on a 2+ when shooting, guide does not affect close combat hits. All you need for him is fortune, doom is better spent because you may get roll a 1 to wound in cc (as he almost always needs 2s)...I still havent quite figured out the best unit for the seer though. If you have wraithguard, I think that could be killer, but getting expensive (You would also need Eldrad as both WG and the Avvy need fortune). I tried it with harlies and although it can make harlies lose their ignore dt rule, I think it's not too hard to avoid and it forces the avvy to be a fire magnet because harleis can rarely be shot anyways.