top niches to focus on from yellowpages.com?

real estate agents. they already spend a lot of money on advertising.

You might want to check the local newspaper...it's filled (or used to be) with local businesses who are spending money on advertising. The bigger the ad the more they spend and you can call the paper and get their rate card to see how much they're spending too...
George

Landscape gardeners, fencing companies, gyms, health spas, gun shops (yup ), business advisors.

There's a few....

Cheers

florists. they are willing to spend big money because they are competing against big brands.

roofers, roofers, roofers....basically, anyone in home improvement

I'm also interested in the same thing as OP except I'm more interested in niches that generally don't have gatekeepers/secretaries (my biggest obstacle in acquiring clients).

Personally, when I cold call and try to find some luck with prospects I typically use the actual paper version, and I search for a particular type of advertisement -- regardless of the niche.

I tend to personally look for average-looking ad spaces. Not the ones that blow me away with creativity, but not the terrible ones either. The AVERAGE ones, and specifically the ones with a web URL attached to the ad.

I then go to the website listed to check to see if the website looks out of date. If it looks even remotely unprofessional / outdated / plain I give the owner a call and let him know that his website seems a little outdated and I explain what services I am able to provide, etc.

The key is to emphasize how a re-design of their website will MAKE THEM MORE MONEY.

This is just the personal procedure I go through. Sometimes, if I'm looking at roofers per say, I'll just google "Roofers in London, Ontario" (my hometown) and I find the unprofessional websites, contact the owner, and so on.

I've had success personally with roofers, contractors, and small businesses of that sort. Lawyers and Dentists will give you larger monetary sales but I've found it's a lot harder to speak to the owners themselves as there's usually some form of secretary/intern/gatekeeper.

Best of luck!

Plumbers and electricians. That's a pretty black and white niche. Either a big company, or a Joe the Plumber business. Just set an appointment in my first 23 calls to plumbers.

I'd suggest startng with a company that spends on marketing already....and has a large number of repeat customers."

Can you provide an example of this type of business?

Personal trainers are good one. If you want to narrow that further, gyms that offer cross fit.