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According to the PD10 spec page on Cyberlink's website, the OpenCL-acceleration requires an AMD 5xxx series or better GPU. So from that perspective, your old 5450 was superior to the 4850  (well that, and it consumed much less power because it prevented you from playing any 3d games...)
If you go with an AMD card, I would recommend a 6xxx series, simply because it has a better video-playback engine than the 5xxx series. (For one thing, 1080p60 H264 playback is fully accelerated on the 6xxx series, whereas it was borderline on the 5xxx.)
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Unless you're absolutely certain the source footage was captured in x.v.color mode, don't bother enabling it. It doesn't gain you anything, and actually incurs an extra video processing-step (to convert non-xv to xv color-space), which will most likely degrade video quality.
If you have a choice between SVRT and hardware-video encoder, pick SVRT. Depending on the edits you made to your clip, SVRT can may be able to passthrough sections of the original source-footage, without recompressing it. That'll give you maximum quality. Any re-encoding cycle will degrade the audio/video a little bit, and unfortunately, consumer hardware video encoding (as of today) is somewhat lower quality than software video encoding.
On the downside, SVRT-rendered clips are not 100% "compliant" with the format specification. This may cause playback problems with some settop/media-playback devices, in which case you'd have to re-render the clip without SVRT.
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I've tried edting some 1080p60 clips recorded from a Panasonic TM700.
Despite being limited to a 30fps timeline, you can still select a custom H264 output profile, and output back to 1080p60 H264. The rendered output preserved all frames (i.e. it didn't internally downconvert to 30fps, and the play each of those frames twice.) The only issue is the bitrate-cap in PowerDirector10's dialog-box ... the maximum allowed is 22.5Mbps, which is somewhat short of the 28Mbps allowed by AVCHD2.
What's even better, is that SVRT worked with the TM700 clips... at least for the simple text-titling operations I tried.
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