What to use as a call back number on marketing pieces/website?

[Doug Haisten]

I am taking the plunge to get a lead generation web site. I am curious for this and other lead generation efforts (direct mail, driving 4 dollars, etc.) do I use a Google Voice for the call back number or should I use my home/office phone (it gets tons of telemarketer calls already), or use the cell phone I carry all the time or should I get a 2nd cell and leave my existing for personal use?

I have read letting return calls go to voice mail will lose some potential customers but then I see many people use voice mail.

Doug