If you are getting a convertible for the joy and fun, get the R129 SL, if you need the back of the car for your kids, skip the R129 SL...I have a SL with jump seats and am only able to put in legless childs...there is just NO room in there.
The 300CE34 conv on the other hand has more room, a better rear seat but still. a shortgage on leg-room...the W124 conv is a lot better as the R129 when you have young kids, but is also too small when you have older (taller) kids!

greetingz,

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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)