LF,
If you like the 338 ME here is an idea for you:
Buy the Marlin short instead of the long. Pick up a Savage 10 barrel chambered to 338 Fed (the ballistic twin to the 338 ME) and install:
http://www.midwayusa.com/viewproduct/?productnumber=179678I did this w/ a Savage 110 270 WCF to 338-06 A-Square and I'm a mechanical MORON who can change oil and, if everything is perfectly ok, brakes (but just barely).
If I can do it, anybody can.
The shank diameter and threads are identical between the Savage 10 and the Marlin. In addition to the barrel you'll need a nut wrench ($23):
http://www.midwayusa.com/viewproduct/?productnumber=288765and go/no-go gauges, $22.50/ea.
Shoot the heck out of whatever you get the rifle chambered to originally and buy those components peice-meal, and then at some point you'll be ready for something more along the lines of what you'd wanted all along.
Just a suggestion...