I just bought a dutch army hooped bivvy.
http://link.marktplaats.nl/449912115 (just for the pictures, the text is in dutch)
60 euro's with a bit of haggling.
It has netting and is quite roomy. Altough i am not sure if the netting is midge approved. I know those little feckers and you need really good netting.
Weighs about 1,4 KG. It's a tad heavier than mij spitfire solo sul tent. But it packs smaller and is less conspicious.
Where are you planning to go? I still am planning for a Aberdeen / Fort William / up north (Ullapool) route.