Easy accessibility and a security from theft are just about mutually exclusive. I suggest you look into a good fire resistant gun safe which can hold all of your guns. It seems that you cannot get one too big, as they tend to fill up fast for some reason. You may be able to deduct the cost of a fire resistant safe as "business records storage". I have two National Security Safes which are excellent. I think their East Coast counterpart is Liberty Safes.
Of course, proximity is a consideration because of freight costs. As to the protection HG, this will necessitate a smaller safe, or lock box. Even one of the soft safes should be childproof. Check into your local laws, as some states impose liability on the gun owner for accidental shootings, or crimes committed with your stolen guns, if you have not taken adequate means to secure them (i.e. a safe).
If you have a secure fire resistant safe, you can save a considerable sum on gun insurance. That way you will avoid having to schedule the gun models/serial nos., as required by some companies. FYI, the D & G combination locks (which seem to be the standard for mechanical locks on gun safes) offer a "day lock" feature wherein you can lock the safe with one turn of a key for temporary use. Most of the manufacturers display their wares at gun shows and Sportsmans Expositions, and you can compare features/prices.
You don't need fancy paint for the garage, and a plain jane safe will offer the same security features, and save you some bucks in the process. Make the seller give you a Golden Rod dehumidifier as part of the deal. These are not expensive, and are an absolute must. Good Luck.