I know while I'm happy to make an additional $500, the amount of time I spend thinking about spending it to try something out which could save me a day or so is getting very small. We're talking minutes to maybe hours.
Stick a big honking buy button there, and make it easy as hell to buy your stuff. Hire a real voice person to explain it if your accent is an issue, toss a presi presentation up there, and go with it.
I'm all for A/B testing, but the problems here are at a much more fundamental level--it is about understanding your market, and matching your customer's expectations. There will be plenty of time for A/B testing, once the sales volume is there to support it.
I'd also agree with @patio11 - the website is outdated, unprofessional and I wouldn't trust it. I'd pay a decent web designer a couple of thousand to get a bespoke design that will be much more suitable than what you have now.