I'm getting married in a few weeks, and our venue has an excellent option for a tasting bar - BYOB. We have been talking about using it for a small port tasting, which we're excited about, though we're relatively new to the world of port. (We did several tastings when we were in Porto a year ago, so we know the basics, but little about practical value options.)
I'm hoping to get some help from the experts here.

We're thinking of having 3-4 different options for people to sample. Our thoughts now were to have one ruby, one tawny, and once nicer vintage port. We're looking to get bottles that are nice enough for everyone to enjoy but also accessible and reasonably affordable (nobody is a serious aficionado who will appreciate a superior bottle).
Based on some basic research, here's what we're thinking:
• Six Grapes (or a ruby in the $20/bottle range)
• Taylor Fladgate 10 year tawny (or a tawny in the $30/bottle range)
• Considering 2001 Taylor Fladgate Quinta de Vargellas Vintage Port (or vintage in the $50/bottle range)
We've also been considering something like a LBV in the $30/bottle range and a 20+ year tawny for the $50/bottle.
Any comments or suggestions you have would definitely be appreciated.
Thanks!
-Terry