Dear Jomoinc: In Theory the long tonearms has, at least, and advantange over the short ones: lower tracking error. Now, this lower tracking error is reflected in an improvement in the quality sound reproduction?, not necessary, because the better quality sound reproduction depends not only of the tracking error but of many other factors like: tonearm design, tonearm build quality, what materials were used for build the tonearm, with which cartridge, etc.
In my experience the short and long tonearms can perform at the same level and usually I can't say if I really can hear the " lower tracking error " improvement. It is really difficult ( at least for me ) and complex to be absolutely precise on this subject.
More important than this is that the tonearm characteristics could match well with the phono cartridge.
I agree with Bigbucks5 about the Ikeda tonearms: great ones!!! and you can choose between short or long one. I am sure that the Ikeda will be a very good match with the Decca London that is a medium/heavy weight and low compliance cartridge.
I don't have any experience with the Decca cartridges in my system but I use my Ikeda tonearm with a " marvelous " Ikeda REX9 cartridge ( that is and MC cartridge with out cantilever ( like Decca ), low compliance and heavy weight. ) and these couple is something that any one that are inerested in the music sound reproduction at home must to hear it !!!!!!!!!!!!!! I never been close to a real live event that when I hear through the REX9, nothing come close to this experience.
Regards and enjoy the music.
Raul.
