Warm weather sleeping bags

[12wheels]

I'm looking for a warm weather bag to replace the surplus poncho/poncho liner combination that has served me well.   I need a bag, down or synthetic, that is light, compact, and comfortable down to 40 degrees f.   My budget is $150.  Any recommendations?  Has anyone used the lightweight LaFuma's, REI Sub Kilo, or SnugPak Merlin?   

[Marshal]

I like my mont bell, the 'hugger' bags are great for side sleepers like me

here is a link to their 1 lb, 40 deg, $170 web special

http://www.montbell.us/products/disp.php?cat_id=53&p_id=1121740

[Rob]

I'm about to try my Lafuma Warm n Light 600 40 deg bag in the Angeles mountains.  It's 42 deg there right now. 

I picked it up for 70 bucks or so ith shipping from ww.steapandcheep.com

I'll let you know if it was warm enough.  Planning on going this Thursday night.

I'll be wearing a long sleeve Icebreaker underwear shirt and maybe a fleece if I have to.  I' probably will use leg warmers, and DeFeet Blaze Wool socks too.

I really want a Big Agnes summer bag though, so that's what i would rec.  It works really well with the pad sleeve built in.   

[Pivvay]

I've found use Western Highlites for under $150. Keep an eye on backpackinglight.com