So if you want to pay less you want your power factor as far from unity as possible
Not so.
The meter on your house reads watts. Power factor correction consists of supplying capacitive reactance (leading vars)to compensate for the inductive reactance of motors (lagging vars). By doing this, the source no longer has to supply these vars and your Kva lowers, NOT YOUR WATTAGE. Your bill won't change.
If you are one of the few and rare individuals that is metered by a Kvah meter, it would help, but most people aren't.
In industrial applications, the farther you are from unity, the worse it is, since in these applications, you usually ARE metered with devices capable of monitoring the Power Factor and will be penalized by the POCO if the P.F. gets too bad.
In theory, P.F. correction on ANYTHING could conceivably lower your bill in that it lowers line losses for the POCOs. Any losses are ultimately paid for by the consumer, so in that respect you would save. However, I doubt if you could tell it on your bill.