The Hilton KL is very nice, but not near the golden triangle. But it's at the train station and a quick taxi or monorail ride away, so it was worth it for me. Very easy to get to and from the airport, which can be an expensive taxi ride.
I have stayed at Traders hotel a couple of times and I think it is a great hotel. The service is amazing, the location is great (at least for me as I was working in the Petronas Twin Towers) and the rates are pretty good. Here is a review with a few photos: http://gardkarlsen.com/Traders_hotel_kuala_lumpur_review.htm