my new SVX Leaking oil

I just purchased a 92 LS-L and I noticed its leaking oil around the seals and on a long trip it drips on to the exhaust and smokes. I was just wondering around how much am I looking to spend to replace all the main seals on the engine? I know that labor is the most expensive part. And would I be better off going to a subaru dealer to get the work done?