An alternative to microfleece 100 weight Fleece mid layer would be the Nomex Merino wool mix Arktis 1514 shirt and Arktis 1515 Trouser. These items are specified for the Eurofighter pilot midlayer under their Ventile flight suits.

http://www.qmstores.co.uk/gbu0-prodshow/AK-1514.html

Swedish Woolpower - Ullfrotte Originals are popular merino wool/nylon mix midlayers also.

http://redrockstore.com/Catalog/index.php?crn=130&rn=812&action=show_detail

I would also shop around for some woolen knitwear especially Merino or Lambswool as these items can sometimes be bought on sale at excellent prices on the internet. They not only hold up better than cheap fleece over the long term but I find they are more comfortable to wear especially after wearing the same old smelly el cheapo fleece for more than a few days out in the wilds.

You could still look smart, warm and fresh after a few days in the wilderness (fleece pants/trousers are a really bad idea BTW) by wearing something like this Aran Merino Wool Sweater, although this might be a little too warm for what you are looking for.