You can get additional tubing from a local hardware store if needed. Old-fashioned hardware stores sell it by the foot. I'd build it with what you have and only add tubing if the pieces it came with aren't long enough, are moldy, or are missing.
That system isn't big enough to cool all that. Your looking at about $300+ with shipping for the standard CPu/NB/GPU loop.
I'll steer you to some more technical links, please spend a few days (DAYS) reading posts, searching, learning. Don't forget to look for your case with WC. Google your case and the word watercool or some combination of that. WC stuff is larger than you think, I know from experience. WC setups done right are awesome and almost silent.
yea the standard thermaltake cooling is crap, i bought a kandalf lcs and within 3 months replaced the whole loop, with on that cost me over £300, im wanting to sell the case with the watercooling if ure interested pm me and ill give u the details of the loop etc. oh and i only want £100 for it.