I have a port as well - was never even given the option for a PICC line, but I think I would have opted for the port as well. I had continuous infusion chemo for 5 weeks (as most rectal ca patients do, I guess). When I was in the hospital, they used the port for my saline, drugs, and to take blood draws. Much better than an IV in the hand.
I will need it when I start FOLFOX every 2 weeks as well.
I don't really notice it too much anymore, though as I am very thin, it does stick out quite a lot, especially since I have lost an additional 20 lbs since being diagnosed. You can even now see the little screws.
But it doesn't really bother me...I am just used to it I guess. Most of my clothes cover it, and those few shirts that don't, I just wear a tshirt under it if I care if it is seen.
I would say go for the port. It hurts for a few days after being implanted (raising my arm hurt quite a bit for awhile), but that goes away.