You can get a machine just for the work, any PC with over 1Ghz CPU and firewire interface will do the job if your camcorder is digital one. You can speed a lot of dosh for a super PC.
The one PC cost £999, I think, is pefect for your requirement no matter your camcorder is digital or anologue.
Which machine I am talking about? Toys R Us click here
If you are really into film editing, you need a dedicated real-time video editing card produced bt matrox: Matrox RT.X10 which costs around £500 itself.