I owned a panasonic DMR-E95 for a short while, & I would say the 1920 would be significantly better; both picture wise, & in sound. Most DVD recorders are not the best playback machines, and I found the DMR-E95's sound to be pretty poor & quite digital sounding.
I must add that I haven't demoed the 1920, but I have a 3910. I would imagine that you will get fairly decent CD playback on it, but not as good as a £200 pure CD player, but way better than the E95. SACD is meant to be decent for the price according to some forum members, that's if you want this format.
The 1920 does have a buffer for layer change, so I would think this should be much better than E95.
Yes, you will have to purchase a seperate HDMI - DVI lead. The connections you mentioned should work fine.
AFAIK there isn't much to rival this player at this price.
You should get a very decent sound with your Pioneer amp. If you use digital coaxial connection from the 1920 to your amp it may give you better sound than using the analogue outs of the 1920; but you would have to experiment with this to hear which you think is best, and for SACD & DVD-A you would have to use the analogue outs on the 1920. However, audiophiles will always reccommend a pure stereo amp rather than a reciever, and a seperate CD player, or an add on DAC for the 1920, but by the sounds of it you would probably be happy with just the 1920 & your current pioneer.
I think to improve sound for music further, after getting the 1920 (if that's what you decide on) would be to get a new speaker system. The Genies will be pretty good for movies up to a point & not bad for music. But, to get some proper decent bookshelf speakers would definitely improve things a lot - for the future sometime perhaps
T.
p.s. The best thing is to demo one. If you have a sevenoaks near you or any good AV retailer I'm sure they will help.