I have the Porter Cable 7539 (an older version of the 7539 model, 1-speed, soft start)
This is a massive and very powerful (3-1/4HP) router. Mounted in a table, it is kind of a mini-shaper, capable of making raised panel doors (I've done it) in multiple passes. In my opinion, it is too big for most handheld operations. I have used it handheld to rout edges on custom desktops and table tops, but I cannot imagine any use, handheld, in lutherie. Mounted in a table, it would do a great job of cutting slots in necks for truss rods, but then, even a 1HP router can do that easily. I know there are a few luthiers that "carve" neck edges using a shaper, and that is really about the only possible use in lutherie for the 3-1/4 horses in this baby.
If you want a very smooth, powerful, well-built router primarily for making furniture, with a few table-mounted operations for lutherie, I wholehearted recommend this router. However, if this is strictly for lutherie, I'd look at a nice 1-1/2 to 2 HP router such as the Porter Cable 693LRPK (or the 694 version is variable speed, but I don't see a need for it. I think of slowing down a router only when I have a massive bit in it, such as a bit for raised panels or cope and stick joints - otherwise, I would always run 'em "balls out.")
With the $100 you just saved, if it's burning a hole in your pocket, buy a new Ridgid 2401 (not the 2400) laminate trimmer, which I think is better than a PC 7310 or Bosch Colt.
Dennis
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when I pull that puppy out, actually am 
. The router is smooth, stable, easily adjustable, accurate, and very flexilble right out of the box. I would not hesitate to buy another one and am patiently and constantly looking for a deal on one of their sanders. Wish they were cheaper, but sometimes you do get what you pay for.