There are so many west coast hosters, it would be hard to list. We have servers in 200 epaul which have great pipe. If you search around you can probably find others hosting from there and there are many in the LA area that are also fast.
$12 for a gig is a reasonable request, but with 4 domains, what you are essentially asking for is a reseller account or 4 250 meg accounts at $3 each which is a low price. Doesn't mean it can't be done, just watch what you get, cause too good to be true usually is. You push that number up a bit you can get a solid reseller account with those specs. Good luck in your venture.
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You can use the Find My Host feature of WHT in order to find for a host of your choice. You can also look into the offers section under the advertisement forum. You will find plenty of offers for the shared hosting. And the requirements that you are looking for will be available with most of the hosts.