Personally, if you're not going HD, then I would stick with the miniDV right now. That 3-year old Sony is probably still better than any flash SD cam you can get.
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Any HD MiniDV cam will give better results than the HDD/ Flash Memory Cams. I can't speak to comparing SD MiniDV to flash though. From what I have read the compression level on ACVHD is such that the video quality will not be as good as that on tape. I read where ACVHD has at least one or two more generations to work through to get the quality level up.
Again, it's not so much a matter of resolution, it's about compression to get as much time on the HDD / Flash Memory as possible.