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I've always ridden in pure merino tops for quite a while now, but after the thread on here a few days ago I thought I'd try one of the merino-synthetic hybrids.
Just got back from my first ride in a Helly Hansen Warm Freeze top, which I picked up on Amazon for just £25 (thanks to whoever it was that posted a link to those!). Very impressed. All the warmth, comfort and stink-resistance of merino, but wicks and dries much faster.
The black HH tops are still under half price on Amazon, for those that are interested ([url= http://www.amazon.co.uk/Helly-Hansen-Lifa-Warm-Crew/dp/B001KGV2RI/ref=sr_1_1?ie=UTF8&qid=1352127503&sr=8-1 ]link[/url]). Well worth it at that price, IMO.