I don't think anyone means any ill mate, i personally love the supra's and i intended on buying one a few years back. My humble opinion is that, I paid £15k for my Zed back in Feb knowing full well the power it had and for that money I could have had some serious old school power but I chose the Zed. Mainly because of the great drive, age and head turning looks. I recon most people on here would think it a bit odd to PX there zed for a much older car AND have to chip in extra cash. As said its not about the power with the 350's its the whole package.
Im not slating you car in the slightest, i would love to own it and would love the extra power, but just not in place of my zed. I think most owners would agree so its possibly why your not getting any bites on here.
I think your car is worth what you are asking for it and if its as minted as it looks someone will have it away in no time.
R