Well, as ozij said...the Pro 2... not just the older "Pro".I would always want to get the best equipment that has alot of features even more than what I need, So if I was to go with RemStar I would want the Pro.
And if you want more features than you might need...think "autopap" instead of straight cpap.
The Respironics REMstar Pro 2 is a straight cpap (set it for a single pressure) machine. Same single pressure blowing at you all night, even if it has C-Flex to reduce the pressure some each time you exhale.
The machine I use is an autopap - specifically the Respironics REMstar Auto with C-flex and heated humidifier. An autopap can be set for a range of pressures, delivering whatever pressure is actually needed throughout the night.
In general, an autopap is the best machine to get, imho. That particular autopap can be set to operate in any of 4 modes:
1. cpap
2. cpap with c-flex
3. autopap
4. autopap with c-flex
Very versatile. Using it in auto mode (with or without C-Flex) is almost like getting a mini-sleep study/titration every night.
Get the Encore Pro software for that autopap and you are well on your way to being able to monitor and tweak your own treatment.
Another excellent autopap is the Puritan Bennett 420E . Uses Silverlining software. The PB machines do not have any exhalation relief feature like the Respironics' "C-Flex" feature. If the single pressure the doctor prescribes for you is no higher than 10 or 11, you probably are not going to have difficulty breathing out anyway after you get even the least bit accustomed to cpap. You probably wouldn't really "need" C-flex for comfortable breathing at lower pressures.