Well 'better' is subjective... 5500K (actually 6700K - I dont think there are 5500K PC's) would probably give more PAR but the light would look fairly yellow. Not many people find that appealing. Personally, using all 10000k is about as white/yellow as I would want to go.
However for budget reasons, I wouldnt get into buying new PC lamps to experiment. Try out what you have with some lower light corals placed higher up in the tank and maybe start budgeting for MH down the road. People often sell single MH pendants in the classifieds for reasonable prices. Just my $.02.
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