A lot of people are going on about using a Katana as their weapon of choice for close combat, if you're referring to a decent one, just make sure you've spent a lot of money on it and that it's properley made. A lot of the "Katanas" on the market are just drop forged steel, and are made to not hold an edge very well (especially those available in Europe after several incidents involving mentally ill people and "samurai swords" in the press). After a couple of days, most of these are little more than nice looking blunt instruments.
For more info check out my disscussion: Best weapon for a zombie attack. Many people bring up alot of good points and I do as well (if i do say so myself). Hope its of help.
i would use a rifle like a winchester model 200 or a ruger model 44 or a tactical pistol(anything glock brand will do well, a taurus revolver with reload ring might work) or a automatic shotgun like the pancor jackhammer(although you will need alot of ammo)
I like the distance weapons the most, but in close range, a SPAS-12 will do. Make sure your face is covered too, don't want any of the juicy blowback :D.