I heard nasty things about TigerDirect a few years back, so I skipped ‘em outright and went for Newegg.
http://www.newegg.com/Product/Product.aspx?Item=N82E16883107588
Micro Center also makes wonderful PowerSpec desktops. The one I bought in 2007 had a parallel port, though I’m not sure if they have them on the newest ones.
I order quite a bit from Tigerdirect. Never have had a real problem with them.
Their prices are pretty competitive. I live in a small rural town of 14,000, so not much local shopping opportunities, except for Walmart.