I like to travel with my wife and another couple on a weekend trip. thats tough in a 172 or an Archer.
Our two Archers have useful loads of 1006 and 1004 pounds. Full fuel (4 hrs plus reserve) puts payload at about 717 pounds for both, which is enough for two 200-lb guys and two 125-lb ladies with 67 lbs left over for bags. Not too shabby.
1213 useful on our 182. Ours will carry a ton of fuel, but if you only put in 4 hours worth (3 + a healthy reserve), you're looking at 889 payload. Unfortunately, you've got to burn off 2.5 of that 3 hours of fuel (150 lbs) before you land, so shorter trips require some extra planning (and pulling more fuel out). Full-fuel payload is 739, again you have to knock 150 off before you land, but with slightly over 6 hours worth of fuel aboard, you're probably going somewhere if you've got it full!
Frankly, I'm surprised the Diamond Star hasn't been mentioned. 660 lb payload with 4 hours of fuel, 140-145kt and a very large comfortable back seat with its own door. I'm 6'4" and it's the only 4-seater back seat I can sit in comfortably. It sips fuel, doesn't have retracts or any other mx-hog types of items (yet anyway). Given the conditions listed, I'd say this one comes closest to the perfect airplane. I love the 182, but I don't consider it particularly economical. (Nor do I consider the Bo to be all too economical either.) Best economy is either the DA40 or a Mooney.
As far as what *I* consider the perfect airplane to be, without the above restrictions: Siai Marchetti SF260. Comfortable side-by-side fast cross-country traveler that you can use to do some loops and rolls along the way.
However, if the LoPresti Fury actually makes it to market, it should beat out the Marchetti by just a hair. Very similar design philosophies, though.