Since you want sporty and classy, don't care how big the back seat is or what gas mileage it gets, and said the magic number $25,000 I'm going to give my two cents and pimp the car I own and know best:
2003/2004 Cobra is in that price range with 20k-30k miles and can attain 500 HP to the wheels with very little in bolt ons if you crave performance. If you find one original owner and factory stock, it's often been taken really care of or been a garage queen. Forget anything you know or heard of about Mustangs, the 03 Cobra is in a completely different class of car with the Viper and Corvette, or as close as you can get for 1/3 the price.
At 3,665 lbs for the coupe it's lighter than any of the new muscle cars coming out (Charger, Challenger, GT500, and safe to assume the new Camaro given the trend, are all at or pushing 4,000 lbs) and is as legendary as the MKIV Supra TT when it comes to stock bottom end robustness and power potential per dollar spent on mods. A pullied or Kenne Bell/Whipple '03 Cobra is virtually unbeatable on the street. On the more technical side, its got independent rear, 4 wheel disc brakes with ABS, Brembos, traction control, severely underrated hand built 390 HP/390 TQ supercharged 4.6L 32v DOHC V8 built with an iron block, 6 bolt mains, forged crank and Manley H beam rods and forged pistons at 8.5:1 from the factory, mated to a Tremec T-56 6 speed also used in the Viper and Z06 and pretty much any high performance RWD 6 speed car made.
Aside from suede leather seats with power driver seat with power adjustable bolsters, lumbar, simple silver and electroluminescent gauges, and stitched leather steering wheel, shifter, and parking brake lever, and metal inlaid pedals, the interior is a bit dated and clumsy.
But it's a raw muscle car that owns at the stoplights, it's not a Lexus or Caddilac. It's not just for the straights either, it can carve the corners and hang out with BMWs and Corvettes in that department pretty well too considering that it's 'just a Mustang'. While not a Lotus or Porsche obviously, the suspension and handling of the '03 Cobra is the most overlooked and underrated aspect of it even though it's probably the part that received the most attention from SVT. The biggest strength of the 03 Cobra however is the insane power modability on the stock engine. I don't think any other car comes close for the money other than it's import sister, the MKIV Supra TT.
A LS2 GTO is also a comparable car in that price range, as is a Supra TT if you can find one in that price range, as the prices on 6 speed TT Supras have gone up and the cars more rare since the Rice and the Superglue movies came out.
On the more balanced side of things if you want a little bit of everything and reasonably sporty:
I'd say the last generation of BMW M3 (with the 333 HP straight 6) also for an excellent all round jack of all trades master of none type commuter (better interior than most cars with more power, but more sporty and powerful than a dull all out luxury car), but I think those are in the $25-30k mark.
350Z and G35 from Nissan/Infinity...
Toyota doesn't have anything really sporty but the new Avalon and Camry with the 2GR-FE are nice in terms of power and luxury features for the money.
And I haven't kept up on the Honda/Acura side of things to say anything about them.
Come to think of it there are too many nice cars in the $25k new or used range to list them all, so unless you have some more specific requirements in mind, it's going to be overwhelming to choose due to the number of options available.