i don't know what the V1 is. did you mean the RX-Z1? the Z1 is much more expensive than the 2500, if you can even find the Z1. i can say that the 2500 is a good performer (for me, my room, my speakers, etc.). everyone's ears are different, though. the 2500 seems to have good hardware and is generally reviewed well. if you can still find it and don't the the HDMI features on the 2600 (it's replaced by the 2600), you should be able to find the 2500 for well under $1,000. mine cost $800 back in october 2005. i believe this web site is in the process of reviewing the newer 2600, but it will cost you more than $1,000.
PS - FM reception for my 2500 is hit and miss. it could be the placement of my antenna or the trees behind my house or sometimes the weather.....but, my experience with FM reception is a mixed bag and i live in a major city with lots of powerful stations. some days it's good, some days it's bad.