Deciding on a ballpark range will help you pick out the lawyer you want - usually more established lawyers will charge higher fees but they're not necessarily "better", especially because in your case the types of trademark claims they are probably going to go after you for, trademark dilution and trademark infringement based on confusion are straightforward and could be handled by someone right out of law school. I agree with the above poster that on first look their claim doesn't seem that strong; it doesn't seem as if the average user would confuse "sitezoogle" with a google product but again they can plausibly make that claim. I'm happy to give you advice for free and suggest a couple people that can help you in California if you email mdayal [at] ucdavis.edu.