Hi there - wish i had your job
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!!
To be honest for reasonable weather i would suggest the canaries in January, we've been before and had snow on the ground at Manchester Airport and 4 hours later got off the plane in Tenerife to temps in the high 20's and low 30's
This may not be your cheapest option though, Majorca and Costa del Sol offer year round holidays but i would be dubious of the weather.... Having said that we went to Majorca last November and it was lovely - not sunbathing weather but shorts and t-shirts in the day and only a light jacket at night.
I guess it depends on your priorities and what you want from your holiday...personally i would spend the bit extra for the better weather..we're off to Lanzarote for the first time on 22nd November.