[Elecraft] K2/100 Vs TS-850SAT RX perfomance?

[vtnn43e at comcast.net]

I am considering replacing my TS-850Sat with a K2/100 in the near future. There is nothing wrong with my 850, in fact I am very happy with it in general and really love the receiver performance. The area that I live in has a number of, AM, FM and TV stations within 3-10 miles and the rig exhibits very few images throughout the HF bands. BTW, my antenna is a huge loop tuned with a SGC SG-237 Smartuner. The main modes that I operate are PSK and SSB.
 
My main reason for considering replacing the 850 is that it is becoming fairly old and I am worried that if any major boards fail that I will be unable to get it fixed in a few years. Plus the rig is loaded with almost every option available and I should get a good price for it on ebay. Another reason is that one day I would like to get into 6MT meteor scatter and I really like the way that Elecraft transverters integrate with the K2. BTW, is it easy to control an external VHF amp and a mast mounted switched preamp with a K2?
 
So my primary question is how good of a receiver does the K2 have vs. the 850 and how well will it handle an environment with high RF levels? Also, how suitable of a rig is it for data modes (RTTY, PSK etc)?
  
73
Zack
N8FNR