Well, about the weather:
In Valencia (city), temperatures almost never fall under 0º (centigrades)even in the middle of winter: in my 31 years of life, maybe it happened 4 o 5 nights as long as I remember.
This year has been the first since I was a little kid in what I've seen some fountains freezed: it happened 2 or 3 nights this winter and everybody was amazed.
You'll probably never see snow in Valencia city in a whole life. This winter has been told as the worst in many years: no snow at all, only 2-3 nights the cold went under zero...and, as I said, this is very unusual.
The winter here is very gentle, but in the other hand you have certain humidity in winter. Not a big problem anyway: it's like any coastal city.
Very, very few raining days during the year. A big percentage of blue sky days, and, as I heard many people say, Valencia is a very luminous city (I think this is one of its biggest qualitys: it's really luminous).
Hot summer (july and first 1/2 august very hot). Gentle springs ans falls. You can usually go to beach from may to october and have fine weather to stay there even in some october mornings.
Just thinking in weather, I guess that Valencia has the weather you're looking for.
In other matters, Valencia is actually a growing and reasonably successful city. It is medium-sized compared to Madrid or Barcelona (Valencia and its urban area has a global population of about 1.400.000; 700-800.000 in the town center) and is the third city in Spain.
Not as cosmopolitan and culturally bustling as Madrid or Barcelona, but really a nice place to live (but I'm a valencian, so, what could I say?).
It may be a good choice, but I know that moving is never so easy.
If you eventually come, welcome and enjoy.
Anyway, good luck wherever you decide to go.