SP10 MK3 recommendation

So I'm in the process of upgrading my analog set up. I just bought Albert's SP10 MK3 and I'm trying to decide on arm/cart combo. I'm freaking out a little because I don't want to make an expensive mistake.

My current arm from my last set up is a 10.5" Reed 2P. I might stay with this arm to start with, but I see a lot of 12" arms on the Technics tts so I'm not sure about the length. I'm also trying to decide on which cartridge. I'm leaning towards the Lyra Atlas or Airt Tight Supreme.

My current system is VAC Sig. IIa preamp and VAC Phi 300.1a amp. Speakers are Margules Grand Orpheus with Acuton (ceramic) drivers. SR ICs and Pranawire speaker cables.

So I'm looking for feedback about Reed arms with the SP10 tables and especially 10.5" arms.

Also looking for thoughts on synergy of Reed arms and the two cartridges mentioned above and in the context of the rest of my system.

Here's to a great (sounding) 2013 to all!