Between 20 and 30 VPIP and 15 to 25 PFR is best.
I personally play around 33/25 in 6 max. I played around with various styles (played 45/35 for a while and tighter for a while too) and this is what fits me. However, it varies wildly depending on the table and my seat on it. I just usually screen for nits on my left and tards on my right which enables my looseness.