If you are not set on a large arbor reel, the Orvis Battinkill BBS is a very nice reel. It is around 3.6 oz. and reasonably priced for a quality reel. I got one for my short 4 weight and it balances very well.
If you are set on a LA, you would probably need to look at a Ross Evolution or Sage 3000 series. But these will run you much more money!