I pretty much will need a full face mask as my nose isn't in perfect condition. What happens if I were sleeping with a full mask on and the power goes out?
Are you sure you need a full face mask? Has anyone suggested using nasal pillows? They won't work for everyone, I can't use them because my pressure is to high (14.6cm) and the noise of the air rushing through them sounds like a wind tunnel. But, they may work for you.
Have you tried other masks, made by other manufacturers? Not all masks are alike. A mask which works great for one might not work at all for someone else. What kind of mask did they use on you? Was it a Comfort Gel or Comfort Lite?
As for mouth leaks (which might require you to use a full face mask), they can sometimes be overcome with other methods. Such as a mouthpiece made by a dentist (expensive) or maybe a homemade device such as I use. Cost me about two bucks to make and is much more comfortable than a chinstrap or taping your mouth closed (yes, some people do that).
Do not just take the word of your DME! Many of them just want to sell you something. Most of them don't know SQUAT.
Take control of your own treatment. Most of you are gunnies, and you don't go into a store and let them tell you what you need to buy. You get educated on what's avalilable, then you go get what you want. This should not be any different!
Depending on your insurance and if they don't require renting the machine first (or if you are spending your own money), you may be able to buy your machine outright.
In that case, you can get your equipment much cheaper if you don't buy it from a DME, Most of them charge up to twice what you would pay if you bought it yourself online.
Here's an excellant and reliable souce for all your CPAP needs.
http://www.cpap.com/There is a link on their site for billing your insurance company.
http://www.billmyinsurance.com/