I've got some Marmot kit (Precip jacket and troosers), which are excellent for hard training (running, etc) outdooras although I do use the troosers mainly when I'm stopped or resting.
You can wash goretex jackets before reproofing them - used Adi007s method. The comments about detergent are correct (don't use it!) but you can use pure soap powder flakes. Bare in mind that it won't get your kit as clean as detergent but maintains the waterproofing.
I've used Nikwax TX Direct washes on North Face Summit Series and my Marmot and it works well at restoring the durable water repellent (DWR) coating. You can also use it on some fleeces too to make them showerproof!