Best Way for my TT to reach my Pre-Amp!?

Craig
Another option.
What is above the Marantz AV7704 ?
Install a wall shelf just above it. The shelf should be attached to the studs of a load bearing wall. Place you Rega on this shelf with cables feeding the Marantz below.

If the Marantz is in the middle of the rack move it to the top. .
Best to link a pic of the setup.  

Cheers Chris

^^
stop being a snob. 
everybody starts somewhere. 
by his avatar they look to be my sons age 25' ish. they are the future of this hobby.  

the better  AV''s usually knock off the extra amps when phono is selected and go into discrete stereo mode. 
 
Craig - I would go to bestbuy or a like store on black friday and just pick up a 6 foot anaconda like looking rca cable - 8^0 . try it out and return it. you can't hurt anything.  

Pick up the marantz and place it one foot 12 inches in all directions. 
use a temporary stand if you have to. 
Does the Hum change ?