The abyss 2nd stage you posted a picture of is a few generations old but other than the cover it is functionally the same inside as newer abyss 2nd stages. The 22 1st stage with the prestige is nicer from a cosmetic and weight standpoint and it will definitely have the non spherical seat poppet like current models, the problem you will have is when the plastic mesh grid of the prestige 2nd stage breaks you will might have a tough time finding a replacement cover.
I believe the red "T" on the older MR22 1st stage indicates the "newer" T style high pressure poppet, this also mean the high pressure seat is replaceable and not machined into the body of the 1st stage. The biggest detractor of this 1st stage is it is heavy but that should only be a concern if you plan to travel by air. The MR22 1st stage that comes with the prestige 2nd stage is newer, lighter, but there is nothing functionally better except that it might have a later generation of high pressure poppet with more durable sealing surface but given the age of both of them they should be serviced and this part could/should be replaced with the latest poppet design.
Whether you should trade it all in for other gear or not is based on whether you want a reg set or other gear. The recommendation would be contingent on what other gear, how old it is and what condition it is in.
Since all the reg sets are old enough to need servicing even though they are in the box, perhaps a decent recommendation is for you to keep the MR12/proton metal setup, have them serviced and use the $80 to purchase an spg and octo and then dive the crap out of the setup for the next couple of years.
-Z
I believe the red "T" on the older MR22 1st stage indicates the "newer" T style high pressure poppet, this also mean the high pressure seat is replaceable and not machined into the body of the 1st stage. The biggest detractor of this 1st stage is it is heavy but that should only be a concern if you plan to travel by air. The MR22 1st stage that comes with the prestige 2nd stage is newer, lighter, but there is nothing functionally better except that it might have a later generation of high pressure poppet with more durable sealing surface but given the age of both of them they should be serviced and this part could/should be replaced with the latest poppet design.
Whether you should trade it all in for other gear or not is based on whether you want a reg set or other gear. The recommendation would be contingent on what other gear, how old it is and what condition it is in.
Since all the reg sets are old enough to need servicing even though they are in the box, perhaps a decent recommendation is for you to keep the MR12/proton metal setup, have them serviced and use the $80 to purchase an spg and octo and then dive the crap out of the setup for the next couple of years.
-Z