Cat 5 will generally be high in capacitance. Some amps do not like high capacitance speaker cables. Not being into amp design I do not know the reasons for this, although a search of this forum may provide an answer. Anyway, if you want the total teflon cable (teflon insulation on each wire and a teflon jacket) I'm probably the only source for short runs (less than a 1000 foot reel - because I bought two reels a couple of years ago and still have plant and I mean plenty left). Your best bet for a low capacitance CAT 5 cable will most likely be a six cable modified circular braid. This will consist of two CAT 5 cables run straight and 4 CAT 5 cables braided around it.
Also, in general, you'll need 20 - 30% more cable than the finished length speaker cable. So, for a 10 foot cable start with 13 foot lengths. 70 cents per foot plus 6$ S&H (up to two hundred feet, and I'll include the instructions for the circular braid). PM me.
For the connectors I use GLS. I like them because they are very beefy and inexpensive and use two screws to hold the cable
http://www.speakerrepair.com/Merchant2/merchant.mvc?Screen=CTGY&Category_Code=AHH_Banana
For the heat shrink stuff, I usually get mine from Merithian (merithian.com) or Heatshrink.com. I also use shaped pieces from Nelco products for the ends. In the post attached below, the bottom of the first page you'll see some pictures of the cable I think you want to make. You can also see the shaped end, barely (under the heat shrink label).
http://forums.audioholics.com/forums/showthread.php?t=15282
