$30,000 for used equipment, $50,000 and up for new equipment is a good range. Don't skimp on things like good lenses, lamps, reflectors, screens and stereo. The minimum today is Dolby SR in all the rooms. It's better to go Digital all the way. You don't want some punk kid telling you that his sound system is better in his bedroom.
Banks will not give you a loan for equipment. They don't understand the business and they wouldn't know what to do with the equipment if you defaulted. They will only give you a loan for something they understand or if you are a multinational business with some nebulous get rich thing like Enron. Get their attention and ask for a billion.
We leased our new seats. The leasing companies will put you though the same hoops as the banks will, but they actually are in the business of loaning companies money for equipment. Most equipment companies have worked with leasing so ask them. You need to go with a leasing company that has some knowledge of your industry. Restaurants lease kitchen equipment; Airlines lease planes, brewery's lease canning equipment, and Utilities lease power plants. It works.