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Would suggest headers and a 180* tstat to your mix to put a bigger grin on your face.
How long is it taking to warm up? And are you talking about the motor temp or hot air temp in the cab? Both the 04 and 05 take the same amount of time to warm up and the 05 is stock on the t-stat, the 04 had an 180* and now a 170* on the new motor. Both take about 10 mins of idling at the house or about 3-4 miles of driving when its 30 and below. Both of my trucks have the factory tow package also.