Leave it stock. While they're may be a plethora of great mods out there, if you intend to resell later, trying to explain the mods to someone unfamiliar with them is imho a pretty big turn off. Individual components are voiced to work as an system, or they ought to be, that's why you're dealing with a professional designer in the first place, right?
In the same vein, manufacturers who tout their great sounding components and then simultaneously offer an upgrade package including the parts that REALLY make it sound great are kinda goofy too. Yeah I know they're trying to hit their price points, but what they really accomplish is making their "unimproved" models instantly obsolete.
As a final note, it used to be a comfort to see any manufacturer who offered just one model preamp, power amp, etc. Ostensibly this was the best he wanted to offer the public. Integrity of purpose and integrity of design, if these things are important to you, don't fix it if its not broken.
In the same vein, manufacturers who tout their great sounding components and then simultaneously offer an upgrade package including the parts that REALLY make it sound great are kinda goofy too. Yeah I know they're trying to hit their price points, but what they really accomplish is making their "unimproved" models instantly obsolete.
As a final note, it used to be a comfort to see any manufacturer who offered just one model preamp, power amp, etc. Ostensibly this was the best he wanted to offer the public. Integrity of purpose and integrity of design, if these things are important to you, don't fix it if its not broken.