If I'm not mistaken, that looks like an SP2 swing arm, which could mean it is an SP2 (Did SP2's come out in the US that year just like the rest of the world? I think so, but check with the seller). The SP2 has a lot of differences that aren't immediately obvious until you really compare (Although both are great bikes and riding wise, there's not a lot in it). Most would have an SP2 over an SP1, as it has things like lighter wheels, better swing arm design, thicker front discs, larger steering stem diameter, different (lighter) seat frame, etc.
You'll be able to tell if it's been down by looking at each panel very carefully, check mirrors, bar ends, foot pedals, spindles, etc. Check carefully also for signs of repair to the inside of the front upper cowl. All these should give clues to the condition and history of the bike. Check also the engine - taking the side panels off - for corrosion, bent radiators, etc. Also if this is with a mature owner, how long has he had it?
I don't know why people use rubbish pictures to sell vehicles sometimes but it may work out to your advantage in this case.
An adult owner may mean it hasn't been wheelied, etc. which can lead to gearbox problems. The less abused a bike is, the better it'll be.
He doesn't mention a Power commander, which ideally should be fitted if using after market exhausts, although those Yoshimuras will probably run OK with the standard fuel map. I don't know... but plan on that as an upgrade sometime. It's possible to pick up a PC3 for cheap.
If it's got an LED undertail, check it's (a). bright enough in the dark, (b). well fitting, (c). wiring's not a mess under the seat cover.
You should also have a passenger seat pad together with the solo tail cover as shown in the picture. Make sure there's a tool kit too.
Chain should be checked too for wear (tight spots) and sprocket (back one will tell) too. Ask what gearing he's using. If it's something like 15/41 or 15/42 then he's obviously researched the best ratio for road use. Doesn't mean it's bad if he hasn't though. I'm sure many people use standard gearing.
It's best to tentatively talk price but say the final decision is based on inspecting the bike. If the machine's really good and you get a good feeling from the seller, be good to the guy and give him a bit more than you negotiated or a decent offer, life's not always about getting the most & giving the least. A good SP2 is worth the asking price, if it's really sweet.
From the miniscule undetailed pictures on Ebay it looks a better bike than the black one to me, but you'd need to check it well & carefully to know for yourself.
Euro RC51 SP2: HRC WSB Ti Hi-Level, T1 Airbox & Snorkel, PCIII, Dymag CA5 Carbon Wheels, Ti64 Spindles (F, R & Swing Arm), Mori Link, Maxton GP7 Shock & Ohlins 832 Forks, Brembo GP Calipers & SBK narrow track (F), Braketech Disc (R), Brembo billet Underslung x 2 Brembo RCS, Tyga Triple, 7075 Stem, Probolt Titanium all over, Babyface rearsets, MR Complete Carbon Lineup, Custom Undertail & CBR 1000 LED, Watsen LED Indicators, Harris Brace, Giles clip-ons, Corbin seat, etc. 2013 BOTY.