I wouldn't buy anything that wasn't AUTO. Its just so much more comfortable. Look at the various models @
http://www.cpap.com . I have a resmed spirit and a Goodnight 420E . There is also the Resperonics w/c flex. Just read the earlier posts before you purchase.. Buy online and save a bundle.. The hardest choice to make is the mask..So many choices and I've heard that most are junk..I am happy with my Resmed mask. The Active is the latest and has had good reviews on this forum. You can also learn more at
http://www.talkaboutsleep.com
Cheers,
Chris