I've just purchased Assault on Ulthuan , and would like some advice as to which battle pack to get to expand my high elf army?

I think these are among the most used cards in HE decks nowadays[Name of Extension first, names of cards in parantheses] :March of The Damned (From Beneath The Waves, Sea Guard Captain, Skinks of Sotek, Citadel of Dusk, Keeper of The Flame), Silent Forge (Outpost of Tiranoc, Descendent of Indraugnir), Twin Tailed Comet (White Lion Guard), Burning of Derricksburg (Lelansi), Eclipse of Hope (Valorous Mage). Not sure if these are the best cards, but these are among the cards most mentioned.=)

PS. There at least two strategies to build HE deck discussed around: Indirect damage and Korhil (HE Hero) rush decks. You can look for cards suitable for those strategies or try to figure out your own (You can also look up the cards/decks that you like at deckbox.org.)

do not forget about one of the best unit removal in game: Judgement of Loec I am not sure but I guess it's from Legends expansion

Indeed Mamut - Loec is from Legends.

Thanks for the help and advice!

Buy dedicated HE b'pack from the Capitol Cycle (Realm of the Phoenix King) - loads of HE cards and I'll buy DE+Skaven cards of you

As a random point, I am selling a full collection of all the High Elf cards from the very beginning of the game and up to the Legends expansion. Im looking for around £50 for the full set of Elf cards taking into account postage.

If you are interested Email me at bayushiryuken@googlemail.com

Im sure it would be cheaper to buy this than individual packs. I can confirm all the cards are in mint condition.