IMO the best classic-looking Sony receivers are the STR-V5, STR-V6, and STR-V7. All three are very similar in appearance (beautiful! :thmbsp: ) and sound quality, with each higher number a little more powerful than the previous one. I haven't hear the V5, but I have the V6 and know someone with a V7, and they both sound fine. I don't think you'd be disappointed with either one. The STR-7065 is also very nice musically, but a little smaller and not as visually appealing as the big V's.
As for Pioneers, I would suggest the SX-950, SX-1050, or SX-1250, in that order (1250 is most powerful and sounds best). The SX-1980 is even more powerful, but has "unobtanium" parts (output transistors, IIRC) and commands a big premium in the marketplace over the sounds-as-good (maybe better) SX-1250.
With Marantz, there are plenty of nice 22xx and 23xx receivers (2230, 2252B, 2270, 2275, 2285B, 2325, 2330, 2385 are all good; the higher the number,the more power) and the best are the 2500 and 2600, although the latter are higher-priced, and the 2600 has an "unobtanium" toroidal transformer which sometimes goes.
Sansui's good receivers to look for include the 8080, 8080DB, 9090, 9090DB, and the higher-numbered "G" series like the G-8000 and G-9000 (G-801s and G-901s in Europe).
There are other brands worth looking for, too, such as Luxman (the R-1050 is very sweet, and the later R-117 is excellent, too), Rotel (their big receiver is hard to find), and some early or top-of-the-line Fisher and even Harman Kardon, etc...
Set yourself a budget, start looking, and something nice will pop up.
Remember that all of these models are around 30 years old, and WILL need servicing (Cleaning/DeOxit, new electrolytic caps and perhaps other components, setting DC offset, bias and alignment) before they will sound the way they are supposed to. Therefore, if you get one and don't like the sound, get it checked and renovated FIRST, before giving up on it. None of the models mentioned --once fixed up-- should disappoint you, but if you do end up dissatisfied, you can always try a different model, until you find what you like best. Some of us have stacks of receivers, and like children, we love them all, each in a different way, for their individual characteristics and strengths.