Apologies in advance for the obvious self promotion but our firm, Spear (www.spearmarketing.com) meets your stated criteria. We're a full-service agency and long time Marketo digital services partner (since 2009). We know Marketo cold, specialize in B2B tech demand gen, and our media offerings include SEM as well as other channels like Social PPC, Content Syndication, etc. Here's a link to a summary of our SEM services: (www.spearmarketing.com/services/paid-search-sem)
Please feel free to reach out to me directly if you'd like to discuss your needs in more detail: firstname.lastname@example.org
P.S. We're also locally-based in the SF Bay Area.