Paying with a cashiers check? Need advice!

So I have a deal set up for a new to me pre here on Audiogon. The issue is the seller only wants to excepts a certified bank check. I have never paid this way before and I am a bit nervous. He says all the right things almost to much honestly. He does on the other hand have fifty some positive reviews and I talked to him on the phone as well. Which is when I got a bit more suspicious after he offered me a deal on a disk player at below half market value. He seems genuinely nice but I’m sure the best scammers do. Is there any way to get extra insurance that everything is legit? And would you guys be ok with it being he has 50 positive reviews over nearly 20 year span?  Looking forward to people thought. And thanks. 
Ag insider logo xs@2xbrylandgoodman
The point is moot now as the preamp has been sold. Either the OP bought it or someone else did.
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I have dealt with a few old school folks who only wanted a check. I used to sell watches and I only accepted wire transfers. Life is a risk.

PS I should read the responses before posting as I see it has been sold.
Going in the other direction, it's unwise to take a cashier's check and ship merchandise immediately.  There are fakes out there, and your bank has no liability.  One of the members of another forum I frequent took a cashier's check for a musical instrument that bounced several weeks later.  No recourse.  I received a fake B of A check that was incredibly well done - even impressed the folks at my local B of A.  I haven't seen one, but apparently there are counterfeit postal money orders as well.  Forewarned is forearmed!
Remember, Paypal solely protects the buyer and not the seller and Audiogon is now in bed with Paypal and only allows paypal transactions, unless one can arrange payment some other way.  I have sold many items over the years to people that lived close enough to drive by, listen to the unit and pay in cash.  

So, in this type of case, paypal is simply useless.  Also, since I really hate using paypal, I always tell potential buyers that if they insist on me using paypal, then they have to pay the paypal fee.  My listing price never includes the paypal fee. ever!

There is risk on both ends.  I accept personal checks and bank cashiers checks.  But, I won't ship until my bank tells me that it has cleared.  Is there a risk for the buyer?  yes?  I sold a classic car to a gentleman in Germany a few years back.  After much back and forth on the phone, we agreed  on a price.  Pictures, documents, etc. were sent.  He wire transferred the funds to me and a shipping company came to my home to pick up the car after my bank told me the funds were good.  Did the buyer take a risk?  yes.  But, communication and documents helped.

 I don't like paypal and don't like being told by audiogon what form of payment I have to take, (because I don't).  But I will use it if the buyer insist and then they have to pay the paypal fee. That's on them. not me, because I don't want to use it in the first place.

Nothing wrong with a cashier's check.  Take the time to have conversations with the seller.  Try to confirm that he/she actually own the item and it isn't a scam.  Pictures of the actual unit and serial number and if they have a receipt that helps also. Where did they buy it, etc.