I like Port, and typically have a few bottles per year. I most recommend a good quality 10 year old tawny port. They will run you about $25 per bottle. If your pocketbook allows it, there are fine older tawney ports too.
From Wiki:
"Tawny with an indication of age is a blend of several vintages, with the average years "in wood" stated on the label, the official categories being 10, 20, 30 and over 40 years. For each category, the average age of the various vintage is at least that of the given category."
Fonseca, Grahams, Taylor Fladgate, Warre, Sandeman are all reputable brands.