Pulling the trigger on pricey equipment


I have the opportunity to purchase a somewhat expensive pair of speakers from a private seller on Audiogon. His feedback is around 30 and mine is around 160. I have never purchased anything this expensive online privately. The speakers will have to be palletized and shipped freight insured. My angst is in I'm sending a lot of money upfront with the hope of receiving the speakers. Are there any suggestions regarding payment (maybe 1/2 upfront and 1/2 upon delivery) or best way to safeguard my money and alleviate some of the emotional stress in this transaction. Is Paypal my best option?
jig
The biggest ticket item I have bought here was 3700.00 for a pair of speakers. The seller had a solid rating and we spoke by phone before concluding the transaction. I paid via PayPal on a Sunday evening and the seller shipped the speakers out the next morning via Fed Ex freight. I received the speakers 4 days later in absolutely perfect condition. I would do it again in a heartbeat.
Do not just look at feedback numbers. Read the comments. Did the seller keep his promises so conscientiously that they merited comment? Did he go out of his way to package securely? Was equipment rated fairly or conservatively? Both equipment ratings would result in the same positive feedback score but might be differentiated in the comments. e.g. "item was as described" "item was better than described".

For example feedback for me frequently mentions the pristine condition of equipment I sell. I have several pairs of white cotton gloves located near my rack. The result is equipment that looks like it just came out of the box. I still tend to underrate due to age. I also ship the same day or one day after receiving payment. I do not get bonus points for that in my rating but it does show up in the comments section.
I agree with Roxy. Speaking on the phone is key, getting a sense of confidence. Reading the comments on feedback too. I've performed transactions over $10k on audiogon before (both selling and buying). The most expensive purchases, however, were from dealers. I think the 50/50 is reasonable, though I've never done it or the escrow (also reasonable, especially if you pay the Escrow fee). For really expensive deals that I've fantasized about, I have though about flying out and overseeing the deal in person. Palletizing is great, and not too difficult with a good shipper (e.g. Pilot Air). I've received 2 pairs of Avalon speakers in crates palletized - very little worry about damage.
Feedback rating and comments go along way. However patience and a tank of gas makes for the best feeling of confidence in a high priced private deal. From a dealer I would not be concerned.
I wired $30k to a guy in Singapore for a high end turntable. He had very good feedback; much more than 30 but still a lot of money to wire to a guy I didn't know and overseas to boot. 4 days later the turntable arrived via DHL as promised. Best part is the shipping was included. Go with your gut after a long conversation, or fly out and watch them be loaded on the truck! Might be cheaper than the escrow service and more fun!