What is the "best" cartridge a Technics 1210...

Thanks again.
Yes, DL-103R with a proper headshell becomes too heavy, for the stock tonearm, I did the calculations.. 
From what I read the best match as MM is probably Nagaoka MP500, but I really want to try MC to hear what is it all about. So I'll take a risk with 301 MK2. The only problem is I don't see a good headshell around 6g for it in ebay :)

Btw, do you know what is the material in technics stock headshell, maybe it's not that bad after all, and I don't need to change it. Just new lead wires will be fine.

And I decided this rewire kit for the tonearm:
http://www.ebay.co.uk/itm/171140634010

The problem is that on the picture I see only external cable.. but it says for the tonearm.. so there should be the internal cables too I guess..

So, my upgrade plan is:
1. cartridge
2. tonearm wires
3. headshell wires
4. achromat mat
5. isonoe feets

And I guess this is the moment where there won't be anything more that I would ask from my 1210 :)

@chakster  what do you think about this rewire kit that I gave link on the posts above?

The wire kit you’re talking about is in fact this cardas litz 33 awg cable http://www.ebay.com/itm/400731159612 But you need two of this for stereo (single run for each channel).

And for internal tonearm wire this single run (500mm piece) is long enough for two turntables (two tonearms): http://www.ebay.com/itm/302220538153

If you can do the soldering yourself all you need is two RCA connectors to make your own cable using those Cardas 33 awg lits configuration.

Or buy the kit someone else made for you (maybe for higher price).

P.S. I think for internal wiring Discovery Cable is better as it’s more flexible. Discovery tonearm wire used in Tri-Planar and Graham high-end tonearms.