The G27 is the evolution of the G25.  It's probably superior (haven't tried it myself), the only downside are the lack of H pattern shifter (on the G25 you can choose sequential or H) and the price.  The difference between the two is not massive and the price difference can be, depends on how good a deal you can find.

EDIT:  The Driving Froce GT can be a good option too if you are not too interested in clutch and separate shifter, and at a better price than the G25 or 27.

damn it..haven't got anytime to play lately.

Going on vacation tomo...can't play for another week! ahh!!

Played some more today.. New record for Normal Car.

1'51.407
About a second better than last record, but still third place for me :)

Nice

Are you using a driving wheel ??

Thanks :)

Nah, I only have an old one that can only be connected to my PS2, I think..
So I'm using a regular Dualshock 3 ^^

Great Tuned time, you just have dethroned me :P You drive with a DS3? That's an awesome time :)

I won't be able to race until tommorrow to try and do better, but I hope you do better, so I'll have to improve more ;) 

Yeah you're also stuck with a DS3? I'll probably buy a G25 or something the week after christmas.
This Academy Time Trial has really pumped me up for GT5! :D

I hope you beat me! that way I'll have to beat ya again! :)

Was able to get 1:46 on tuned car. Better from my previous 2:01.

I have a G25, but it's on my parents house, which I'll only be able to go after christmas XD 

I love racing in the GT games with the DS3 though, it's more of a confortable feeling ;)

I'll try to beat you tommorrow, I think I still can shave 0.3 to 0.4 s off my time, since my 1'38.627 time was done with a massive drift on curve 6 >_<
But after that, I don't know where else can I shave more time to equal Jaaau!'s or Oniichan's time xD  

Amazing, ur giving the top 2 a stiff competition using the DS3

I would love to see your time using a wheel :)