I'd get them both done and get it over with.
Why not DIY with this bearing tool? Works on all Boxsters. Tough to beat at $105+shipping. Instructions on the site say 2 hrs per side. Knock out the whole job in 1/2 a day even w/lots of pp breaks. :-)
I'm going to be getting one soon for my '02S.
http://www.arnnworx.com/BearingTool1.htm