Burke,

It depends on what you want to accomplish with your K2.
Yes, the KSB2 will allow you to use digital modes - the K2 also has a 
3rd set of filters that can be set up called the RTTY filter set (turn 
it on or off in the secondary menu).
The K160RX adds a receive antenna and the 160 meter band.  The K60XV 
option adds 60 meters and a transverter interface.
The KAF2 adds a peaked audio filter that is very nice for CW.
The KDSP2 (which goes in the same place as the KAF2 - you can't have 
both) adds audio DSP to provide brick wall selectivity as well as Noise 
Reduction.
The KNB2 works well with impulse noise (like auto ignition noise) if 
that is a problem at your location.
The KIO2 allows you to control the K2 from a computer or use an 
automated logger.

That is the list unless you want to consider the internal battery or the 
tuner or the KPA100

73,
Don W3FPR

On 9/13/2012 3:22 PM, Burke Jones wrote:
> I am getting ready to put in an order for a K2 kit.  I currently have the
> KX1, which is my only rig.  I want something more substantial at home to
> sit on the desktop and have fun with.
>
> I am definitely getting the SSB option - mainly because I want to do some
> of the digital modes.
>
> I don't want to do the battery or internal tuner at this time (might make
> good Christmas presents down the line).
>
> What other options should I consider and why?
>
> Burke Jones
> N0HYD
> http://www.N0HYD.com
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