Wet vs Dry Vacuum Pump

I am curious of opinions out there. I currently have a wet Vacuum pump on my
Glasair I-RG. I am considering adding an M-20 vacuum pump oil seperator just
for the vacuum pump since I also have a Christen inverted oil system seperator
which takes care of the Crankcase breather. I am also considering changing to a
dry vacuum pump. I am tired of loosing a quart every 4-5 hours and oil mess on
the belly. What should I do? I do plan to use the plane for some hard IFR, I
will be working on getting my instrument rating this winter. Will the M-20
catch 90% or what percentage. Anyone out there using this M-20 model 600WP unit
for vacuum? at $360.00 I don't want to be dissapointed.