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What leads you to beleive you need medical attention for your SIG? If there is a specific problem you may be able to DIY with the Armourer DVD and a couple of parts/springs. I did all of my own work once I knew what the issue was(new springs thorough cleaning).
I have no personal experience, but judging from previous comments on this board, if you have to leave it with R Nichols then you may want to shop around for another pistol to use in the meantime.
Post the problem and maybe others can diagnose what's wrong. I believe The Shooting Edge has spare parts for Sigs. If you're uncomfortable working on it yourself and you're willing to pay, TSE could probably fix it for you too.