Turntable assistance needed!!

[DigitalfreakNYC]

So I was recently given a turntable. It's a Technics SP-10MK2A and originally retailed for about $1500. GREAT condition...and absolutely no issues. http://www.vintagetechnics.info/turntables.htm

This particular table does not come with a tonearm and I was given two options:
THIS IS OPTION A:

It is a Micropoise Rekokut. It's obviously the older of the two tonearms. It doesn't even have a red or white stereo separation color on the attached cords but works perfectly.
THIS IS OPTION B:

I have no idea what kind of tonearm it is but it seems to be the newer of the two. It does say Audio Technica on the black part of the cartridge. However, the problem is that it doesn't have a counter-weight and the few people I've asked about getting a replacement all told me that I have to know the model # of the tonearm in order to find out which counter-weight I should get.

So here are my questions:

1) Which tonearm should I use, out of the two? Should I test both of them? Does anyone know enough about both of them to make an educated decision or does it even matter?

2) Any idea where I could get the correct counter-weight?

3) Does anyone know which make/model the 2nd one is?

Then comes the all important question:
4) What kind of cartridge should I buy? I have no idea how much use the ones they came with have gotten and I'd rather purchase a brand spankin' new one. I don't want to go insanely crazy on price but I'd be willing to spend $250 on one.

I'll be completely using it to archive vinyl to CD and probably my biggest pet peeve of vinyl is the crushing of the high's, ie when singers use "s's" or cymbals are used.

Thanks so much for bearing with the newbie posting but I know someone here will be able to help me out.