You are going to be a Dive Master, a diving professional. You need the best gear that you can get for your money, the best value. Scubapro is the best value.
It would be good if a mod could send you a polite message about using this forum as blatant advertising without any identifying feature disclosing you as a scubapro dealer. For the OP, disregard his post as nothing more than a sales pitch.
The aqualung titan is a fine reg, and is MORE than sufficient for divemaster. The DM program is still recreational diving, and a large part of it is demonstrating skills to OW students in less than 20 feet of water. Believe me, any reg will work. some of the hardest working DMs in Cozumel, guys that guide many hundreds of dives annually, use regulators that most dive shop monkeys might tell you are not suitable for a bathtub.
The first step is to find out if the shop you're interning at (and the area in general) uses primarily DIN or yoke fittings. Buy accordingly, or you'll regret it.
Next, along the lines of what Jim said, is the idea that you are apparently unfamiliar enough with dive gear to know whether or not you can change hoses....not a good sign for a budding DM. But, you can learn this stuff pretty easily in the right situation.
I'd stay away from a console, and get a wrist computer and a simple SPG instead. Take a look at some websites that discuss hogarthian dive gear principles, and you'll be surprised at how much of a departure technical divers' set ups are from the typical 'fat-ass-BC-with-octo-inflator' (sorry that might have been a bit out of line....
) that's pushed by OW classes and many of the shops. Anyhow, the reason I mention that is that if you do end up working as a DM someday, it's nice to bring something different to the education of new divers. There are some things that the hogarthian guys have figured out that really do make OW diving more fun, convenient, and possibly safer.
Of course, that's only my humble opinion....but don't listen to the hype about ' high end regulator X is needed for being a DM"