I'm not going to just reiterate everything already mentioned but I've got a couple tips from my perspective since you asked.
Coming from someone who has sold used cars on the side from Honda Accords to Lexus LS's for many years.. it's basically up to you what people you want to contact you.
If you want low baller's, you focus on the mods, how fast you can go in it, perhaps an emergency situation requiring you to sell it, and no justification for your price. Here's an example that just screams 'come rip me off I need to sell NOW and I'm probably hiding things so I'll even come down more, wholesalers and low ballers HIT ME UP NOW'. Text in brackets are what most people think when they read it->
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i.e.-green NSX with awesome 19's [that's the best part?], [some overpriced] intake/exhaust, goes 150+mph and is steady as a rock [because I did it yesterday], new clutch [because I probably burnt it driving it aggressively], new "racing" seats [because the old ones were deteriorated], gets looks like Ferrari's but have to leave the country immediately so MUST sell [i need cash now]. all offers considered[please offer me 15 grand]. xxx-xxx-xxxx [here's my number because I want EVERYONE calling me] $25,000 [I hope at least, since I didn't tell you why I'm asking that much].
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If you want professionals with the $$$ in the bank to actually buy your car you could go more a long the lines of this..
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i.e.- excellent condition cosmetically/mechanically but not perfect [probably minor issues that are normal, I'll ask him in an email], all maint. records available including recent new clutch [hmm.. clutch is replaced as maint. as opposed to abuse sounds good], knowledgeable owner [hmm.. there goes most my chances of low balling him] and priced to sell 24k FIRM [I won't waste my time asking him to take my civic as a trade]. Email for questions/phone number [hmm.. if I have to go to the effort to email him instead of harassing him now on the phone, forget it], serious inquiries only [OK, I get it, your not going to be low balled].
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Let the pictures show the seats etc. and if people don't like them they won't bother you. If they do like them or don't mind they'll ask you more questions and you can phrase the response to answer the question to your advantage.
a"the seats look OK in the pictures, what happened to the old ones"
b"Nothing you wouldn't find on any other 91 car. They had the usual minor wear/tear from 15 years of use so I spared no expense and refurbished them professionally for $1500 at blank shop."
etc. etc.
Be careful-many unexperienced 'car salesmen' will say 25k or something close to that; or along those lines, or "in the ball-park of". That's an instant 2k off. Might as well just say 23k -FIRM- so people don't waste your time. Trying to be greedy or get more than you truly think the car is worth is usually what wastes people's time. VERY VERY rarely do people pay more than a car's worth in a market like this. Also giving your number out at first can cause problems if you aren't convincing on the firmness of your price. On the opposite side, if you were to say 30k -FIRM- for your car, you might not get an email til 2009, so it can hurt you if you abuse it. Everyone and their mom will call to low ball you because if they call 100 people that seem a little desperate and even one guy says yes, they make 3-5k. Don't ask me how I know.
My math showed me that paying for services doesn't worth it, because it will bump price to the level where I can get car with all records and even original body.
