Or, just get a trailer and your bike will handle better than with any configuration of panniers. I've done it both ways, and will stick with the trailer method.
Of course, this is an old debate, found often in forums and magazines, so to get back to the subject, I started touring with rear panniers only. When I could afford it, I bought front ones and distributed the load. I found it to me better riding and organization to have both front and rear ones.
Cutting weight in general will make a huge difference in handling and ease of riding, so if you can afford it use the new ultralight sleeping bags, pads, and tents. Also, most of us bring way to much in the way of clothes and other accessories. I have learned this from the climbing community, where we can now go into the mountains for a days with 30 pounds or so. Years ago, I would take 50-60 pound packs, and include items like hatchets, etc!