AeroTechDesigns has some good quality stretch fleece bib tights-
http://aerotechdesigns.com/tights.htm#tights
They're warm enough for me down in to the thirties.
They also have some heavierish long sleeved jerseys at a decent price.

I agree with SeattleForrest, merino wool base layer is worth every penny; combine it with a long sleeved jersey and a thin windbreaker and you're golden.