Be careful running huge runs of cable - convert to nice friendly ethernet ASAP!
A colleague managed to get another 50k/sec by changing to a short, custom built RJ11 cable - I know it sounds like the sort of tale you'd get out of hi-fi buffs and their gold interconnects, but it's true!

Also found a modem can make 100k/sec difference - best I have seen is the westell. TBH, the bewan aint too bad. I use one we had sent back in my home smoothwall.