UAEROFLY,
$150 for a new regular Titan is a great deal. I doubt that you will notice a difference in breathing between a regular Titan and an LX at recreational depths. The barrel first stage on the regular Titan is essentially the same as the Conshelf which has been around for at least 40 years. It is tried and true and is extremely reliable. The new LX (2009 model) has a first stage which is essentially the same as the Micron (plus ACD) which has been in service for only about 3 years. While I have heard nothing bad about the new LX, IMO it needs a little more time in service. By the way, the pre 2009 Titan LX had the same first stage as the current (and older) regular Titan, and is a great reg.