I liked how the Internet was featured in this game. But I wish the websites were more usable for Niko. I see ads for cars and restaurants but you can't go and eat at those places or buy special cars of the Internet.

The cars, if you mean like Auto Eroticar, are able for Niko to get- you just need to be able to get yourself to Auto Eroticar and steal them.
And yeah, I must admit it'd be good if you could use numbers and e-mails you find on the internet for the benefit of Niko; I also think it'd be brilliant if you could actually just go, whenever you wanted, to a resteraunt to eat instead of Burger Shot or Cluckin' Bell.

When it comes to the cars, the only cars I've ever seen there were Turismos. Those are cool cars but sometimes I want the luxurious 4-door cars.

I remember it was a car show room in Algonquin, I think it's down the street from the Perseus.

You gotta give the creators a lot of credit thought, the GTA series has come a long way since the days of GTA 3 and Vice City. Remember how basic the safehouses were in Vice City? Then the safehouses in part 3 were even more simple; they just consisted of a garage to store cars.

I personally like the PMP 600s and Cognoscentis. Are those the Bentley type cars you're referring to?