Think in terms of total budget, not hourly rates. The creative factor is affected by longer hours. Go the best place you can afford. Ask about payment policy, most studios require a deposit and notice for cancellation. Ask about discounts, night rates and block rates, they can be less expensive.
Some studios charge extra on some items, ask what is included in the basic rate.
Keep Your Focus and Stay Positive Be supportive of the people working on the project and their efforts. Be positive and encourage, don't discourage your musicians or band. If a player or the band is struggling with their performance adding stress by being confrontational will not help the artistic vibrations. Remember sooner or later it will be you that is struggling and you will appreciate positive emotional support. If progress at times is slow stay focused.