Reply to Looking to upgrade to timecoded vinyl, some questions

I believe I've posted a similar topic a while back, but now I actually have the budget to upgrade so I'd like to make sure I get the gear I need. I'm looking to upgrade from my Numark Omnicontrol (which has been experiencing issues as of late) to the classic 2 TTs and a mixer setup, but with timecoded vinyl so I can still have access to my whole collection. My budget is like $1200-$1400, which may or may not prove to be enough, but we'll see.

1.) The set I'm most interested in is the set everybody seems to be familiar with, Technic mk2 1200s, mostly for their reliability. I'm not too familiar with the concept of timecoded vinyl (I've looked into this question, but I can't seem to find a plain answer.) The thing is I'm assuming there will be other gear necessary to make the tables work properly with my software, but I'm not too sure what. An external soundcard maybe? Would I need any other special gear for the tables to work properly?

2.) Because of my limited budget I realize I might not be able to afford exactly what I want (mk2s seem to go for either really cheap or really expensive from what I've seen), so I'm trying to work out a backup option that won't cripple me in terms of affordability and accessibility (i'm trying to avoid cdjs because they all seem to be expensive, and burning my music to cds would take a huge chunk out of my wallet.) Are there any other model of turntables I should keep an eye out for, perhaps that's more likely to suit my price range.

3.) The mixer I was looking at is the Behringer DDM4000, a 4 channel midi mixer which seems to have a lot of positive backing behind it. I'm willing to work with a 2 channel mixer though if it serves my price range better, though I believe I'd lose my plans of turning my omnicontrol into a sample/effects board as a result. My main concern is whether or not I should bother with a midi mixer or just go full analog. I'm assuming a midi mixer would save me the trouble of getting a soundcard, but in the end would it be more expensive then just getting an analog mixer with a soundcard?

If any of my questions or explanations are unclear let me know. I'll be perfectly honest, I'm still not very knowledgeable about tech, so I might be overlooking something important, or just overcomplicating my situation.