Help with my Google Adwords account

I recently signed up for Google AdWords to drive some eyeballs to my website for my computer repair business, and I need some advice on tinkering with it to get the most out of my money.

I have budgeted $100 a month, and signed up for the Budget Optimizer:

I am getting an average of 2100 impressions per day, yielding 2-3 clickthroughs per day, at an average cost of $1.43 per click through. Does this seem about right? Seems high to me. Once my clickthroughs exceed $3.33 per day, I don’t get any more impressions.

91% of my impressions are coming from Google Partner Sites and content network, the rest are displayed with Google keyword searches. Should I turn off the Google Partner Network, and see how it does on keyword searches alone? Or trust Google’s Budget Optimizer?

My ads are only seen in my service area, if that makes a difference.