WCF is the best choice. It supports a number of different transport mechanisms (including Named Pipes) and can be completely configuration driven. I would highly recommend that you take a look at WCF.
Here is a blog that does a WCF vs Remoting performance comparison.
A quote from the blog:
The WCF and .NET Remoting are really comparable in performance. The differences are so small (measuring client latency) that it does not matter which one is a bit faster. WCF though has much better server throughput than .NET Remoting. If I would start completely new project I would chose the WCF. Anyway the WCF does much more than Remoting and for all those features I love it.
MSDN Section for WCF
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