What tonearm will better mine?


I have been running a 12" Jelco SA750L with an upgraded Decca Super Gold on a Garrard 401 for a few years. I'm happy with the sound and happy with my pre, power and speakers. (Croft 25R, EICO HF35s, -good tubes, Quad 57).
I keep hearing that my tonearm is a weak link even though it sounds pretty awesome to me. What would it take to replace the Jelco and make a significant improvement? What should I expect to hear better? Would I have to drill the massive plinth? Thanks.
128x128noromance
For those who don't want to shell out for the MINT protractor:

Conrad Hoffman wrote:Ok, I admit it. I tested this on the unsuspecting folks at the asylum first. After a few revisions, here's my cartridge arc alignment template and strobe disk generator. It's far smaller than bitmaps of the same thing, plus you can choose your specific pivot-to-spindle distance, groove radius and alignment strategy choice. It also prints pretty darn nice strobe disks. Freeware, no viri, no strings attached. Please let me know what you think.

http://www.conradhoffman.com/chsw.htm

noromance, 

I may have missed it; but have you played with damping fluid? I have a SA750 clone, the Sumiko Premier MMT and like you I sometimes get upgradeitis. Then I buy a new phono cable or something and come to my senses. The Jelco may be underappreciated by some because of it's modest price; but I have found it to better many more expensive arms. If I had $3,000 to spend improving my system, I certainly wouldn't spend it all replacing my Sumiko!
@2channel8 Thanks for the link. Interesting. I added the oil at the start and when it evaporated away, I didn't really notice any loss so I haven't bothered refilling it!
Why dontcha try something different and modern...
Terminator T3Pro fits nicely DECCA cartridges, the designer Vic at Trans-fi Audio used the London Reference as his main cartridge, see his site. And yes, you can adjust VTA on-the-fly with digital scale.

Btw, I use low impedance values for my MM carts. 30 kOhms sounds better than 47 kOhms w/ my Audio-Technica and SHURE carts, they also benefit from very low capacitance values like 100 pF of total value.
Yup Harold, the Terminator is a fascinating arm. I have one on order, should be ready maybe later this month. Mine is being made with an uninterrupted run of silver wire from cartridge tags to RCA plugs, a pair of KLE Absolute Silver I just shipped to Vic. Pics on the TransFi site show a London Reference mounted on the arm, which is what I will be using on mine.
I have a 12" Jelco SA-750L, and a London Decca Super Gold, with the DeccaPod, and a Yamamoto "African Black Wood" headshell.

It is the most obviously RIGHT combination that I have ever experienced.