I would go with the following values...
SPG: 2
GP: 1.5
HH: .5
PC: .6
My baseline is how many points will it take me to get a room I would spend less than $100 on, with GP and SPG, there are a number of $75-$80 properties I would use 4k SPG or 5k GP. PC has a few $60-$90 range properties and HH varies too widely to assign a solid value for.