If you have to stay in this area and continue to go to March ARB, then I think you would be better off staying at the properties in Temecula. I had to work at March a few weeks ago and I stayed at the HI in Temecula. It is a brand new property and has great rates, very little traffic getting to March (you are going against the traffic, not with it when driving from the Hilton) and you will be very happy with the area.
Try it out next time and let us know what you think.