Is it worth upgrading a Thorens TD125


I Have a Thorens TD 125 TT with an SME 3009 tonearm.
I would like to upgrade it.It is in very good condition.
I would like an excellent midrange, very good base and very good treble.

How do I start?
I am not mechanically minded, so I will have to get someone to do the modifications for me.

Where do I start?
And what will I need?

Tks in advance for your assistance
.
doreen
I suggest posting your question in the Vinyl forums at:

wwww.audioasylum.com

www.audiocircle.com
Post removed 
To the best of my knowledge all SME arms take the same cut out, as do several other arms. I was an SME dealer in past years and in my experience all standard length SMEs will fit.
Here's a Hub thread you must have missed:

http://cgi.audiogon.com/cgi-bin/gallery.pl?blog&1260414740

Note that there's an Audiogon member named Chris who specializes in Thorens upgrades.
I wonder what differences are between the 125 and the 124 II which sells for a lot more and before the LP 12 was maybe with EMT and Garrand 301 the table to have (alright 70's had others like Mico Seki).The issue is is it one worth the refurbish/upgrade cost.Just a thought.
Chazz