RobZ,
I have 18X10 on my rears as well with an offset of 48mm. Though they fit fine I wanted to push them out slightly so I opted for the 5mm OEM Porsche spacers. These brought my final offset to 43mm which I think is pretty close to be flush with the fenders. Any more and it would look funny. I think at 42mm you should leave it as is. Judging from your pictures it looks pretty sweet.
Side Note: I run 285/30/18 so mine looks a little bit wider.
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http://i46.tinypic.com/2qx0rqs.jpg
2001 Boxster Artic Silver / Black Interior
-GT3 Front Bumper w/ Lip
-Side Skirts
-Gemballa Exhuast and Cats
-O.Z. Racing 18" Wheels
--18X8.5Front 18X10 Rears
-Michilen PS Tires 225/40/18 & 285/30/18
-5mm Rear Spacers
-Porsche Door Sills
-H&R Springs
-Powerflow Intake
-B&M Short Shifter
-Pioneer Avic-F90BT Navigation
-Focal Polyglass 165VR3
-Alpine PDX 5 Amp
-Bose OEM Subwoofer & Midrange
-Audio Controld DQXS (DSP)
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