"I have this upcoming summer of 2014 completely off." Lucky you! You need to specify the date range encompassed by that in order for readers to give you informed comments.
No matter when you start, three months is just not enough time to hike the whole 2600 miles of the PCT. It would require averaging 29 miles per day for 90 days with no time off. Most thru-hikers start in mid to late April in order to finish before the snow flies up north in mid-October. The rest of my comments assume you start June 01 and end Sept 01.
Large parts of the southernmost 650 miles (Campo to Mojave) can get quite hot and dry by June 1. You might be better off starting at Kennedy Meadows (south) with the bulk of The Herd, and trying for the Canadian border. If it's a low snow year and you know how to navigate safely over snow-buried trail, start at Harts Pass, hike 33 miles north to the border, return to Harts Pass, and continue south for as far as you have time. Finish another year.
Other non-PCT alternates to consider:
Tahoe Rim Trail - 165 mile loop
Colorado Trail - 485 miles (~ 5 weeks at 15 mpd), starting from Denver in mid to late June, depending on the snow conditions. The CT and the CDT are the same trail for 320 miles. After reaching Durango, you could resupply, loop back to the CDT atop the Elk Creek drainage near Silverton, and hike south along the CDT through the south San Juans of CO and on through the high country of northern New Mexico. Alternatively, you could loop back to Frisco/Silverthorne and go north on the CDT into Wyoming.