Welcome to the Apnea Board,
First things first, do not get anything until you read our replies. Do not give the DME any bank, credit or debit card numbers. They don't need it to service you. They do need doctor info, script, and insurance, but again not your bank account etc. They may or may not be shady but let's not tempt them OK.
What did this kit contain from the DME? Whatever, it's too crazy expensive and probably has an ozone cleaner that you don't need. It'll probably include the wrong PAP machine, not even talking about not the best brand. Pump the brakes and read on friend.
Take note you have a choice in brand of PAP and mask. Exercise that right. Also HIPAA empowers you to get the detailed sleep study and titration reports and the script. Get all them for your personal file. AND post them redacted here.
This is just very preliminary without that specific study report. ResMed is the best PAP brand out there for most users. You will want
OSCAR to see your therapy for yourself. It's free and created by members here from another similar program. Again it's free and necessary to PAP therapy success.
Now you mention lots of Central Apnea. You may need a top level Apnea machine called the ASV. IF this plays that way, you will need the ResMed AirCurve 10 ASV or a similar ResMed 9 series ASV to save a bit of money. But let's not go that deep into that direction yet. Maybe a ResMed AirSense 10 AutoSet may work, but using high pressure may be less comfortable with this. So maybe you need BPAP if CA isn't as big a problem as your first post makes it seem. There's a ResMed AirCurve 10 VAuto as the best non-specialized bilevel.
So you see there's quite a few directions and unfortunately not all are going to be right. So we'll wait for your data at the office.
Till then take a breather and visit our Apnea Board virtual coffee machine.