Not really. Blaster isn't really the best use of what casters can do. By the way, why not go Elf? They're basically built for Wizards, and they also give you longbows (and +2 dex), which are pretty much better than Crossbows by default.
... besides, I'M getting dragon breath (the best way to make a blaster sorcerer is Draconic bloodline, really). No doubling up~! It'd be weird.
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There's always hope for better things in life. But you can't let anything, friend, lover, God himself, be your hope. You have to be your own hope.