WinTV are suppose to be some of the best. I have a WinTVPVR150 and I'm very pleased with it. I recorded an old VHS and it preserved the quality perfectly.
The big question though is what do you wish to do with it. These particular capture cards have an onboard MPEG2 buffer. This helps your computer when capturing MPEG2 videos, but it also causes the video to be a few seconds behind the life source. So, you couldn't play any video games with this type...
If you just get a plain WinTV(I think it's called ToGo, or that might JUST be the USB one) but any without the PVR, you'll just have a harder time captureing videos if you wish to.
And finally, about the standards...US is NTSC, but almost all devices can handle either PAL or NTSC...