There are a ton of strings to choose from, but I think reading all these suggestions is making your decision even tougher. 1st--I don't think you're going to be stringing anywhere near the level g4driver is stringing. He has a lot of clients and therefore a lot of data to tell him what strings he needs. 2--you need a little natural gut (but unless people are using it now, most are not going to be willing to string with it unless you really sell it to them to try). I'd go with 16g as it lasts longer than 17, and when people pay that much for a stringjob, they don't want it breaking prematurely. 3--do any reps call on the club? They may give you better deals. If a particular brand of racket sells well at your club, they just may have a rep calling on them. And what racket/string does the club pro use? Again, may be he's under some contract. 4--If none of these apply, you'll have to see if you want to compete on price/service with other stringers on the same products, or try to differentiate yourself by carrying different lines. The club pro where I played used Prince, then Head (when Prince stopped calling on him). He didn't do natural gut. He carried Prince strings, then Head strings. I competed on price with the products he carried, but I could show people more of the latest strings that had good write-ups by not being sponsored by Prince or Head. That being said, Prince Syn w/Duraflex has been the top selling string now for quite a while. It comes in colors (which is good to offer), and is reasonable durable for a syn gut. I'd carry it. But, if you can get Yonex strings cheap, I'd go for Dynaflex. Sell it as an upgrade from PSGD. It certainly looks and plays well. Also, Prince Lightning XX is another string that plays well and looks great. Women love it. So, if you're stringing for women or guys that don't hit so hard, you might want it too, as an upgrade from PSGD. If no one cares what it looks like, Gosen OG Micro works great. But, that 1st impression means more than most people care to admit. 5--you'll need some poly. It's the "in" thing right now. Again, depends on what brands of rackets are being sold there. Babolat has RPM Blast if there are a lot of Babolats. Yonex has a lot of polys too and a solid reputation, if the club sells a lot of Yonex. Same with Head and Wilson. So, how do I narrow it down especially when you have limited data. Start from the bottom--the least expensive. My basic synthetic gut would be Prince Synthetic w/Duraflex 16. I'd carry some packs of Prince Lightning XX 16 in a few colors too. Strings, like rackets, have their preferential colors change about every year. See what rackets are selling. Neon green one year, red one year, black one year, white one year. Black and white can be pretty generic (in a good way), but neon yellow seems on its way out. I like Klip Legend 15L Natural gut. It's thicker, lasts longer, and plays well, especially when compared to a nongut. So, I now have PSGD (different colors, 17 & 16 gauges), Yonex Dynawire 16 & 17g, maybe some sets of Prince Lightning XX 16. On to polys--I'd carry Yonex PolyTour Drive 1.25 and some Yonex PolyTour Spin 1.25. If you're selling more Heads, go for Sonic Pro 16 and Sonic PRo Edge 1.25. If Babolats are selling, get Babolat RPM Blast 16. For a multifiliment, I'd recommend Babolat Addixion 16 or Yonex Super 850 Tour 16. As outliers for having sales etc. provide strings that you buy on sale. Some other outlyers you might want are Gamma Marathon--long lasting synthetic gut. Volkl Cyclone is requested some as is Luxilon ALU Power. For cost, you have to be competitive with current competition or you won't last long. Weigh the racket (cheap & easy to do), keep a record of their stringings. Ask if you need any help.