Page 1 of DVR Decisions

Hello everyone. I`ve been lurking around these forums for quite some time now. Most informative.

I`m in the process of banging my head against the wall trying to decide which DVD recorder/HDD to purchase. With a budget of no more than £400 I`ve discounted the Liteon 5045 (too buggy) and the Panasonic E85 (would like the RW feature to transfer stuff to my PC). So, in no order are my final 3:

Pioneer DVR 520
Toshiba XS32
JVC Drm 20/30

I will be connecting up the RF tuner and Ntl. Although I`ve downloaded the manuals there are a few things I`m not sure about. I`m sure you`ve all been asked these questions a thousand times but here goes anyway.

1 - Do all 3 have a scart pass through when the machine is off or do you have to have it switched on all the time?

2 - Are you able to store mp3s on the hard disc so the machine can be used as a jukebox?

3 - I know the Tosh has an IR blaster, but is there any other way of controlling channel switching of the Ntl box through any of these machines?

4 - Are all recorded discs (with the exception of DVD RAM) compatible with all PCs?

5 - What are the relative qualities of the RF tuners?

6 - Are you able to record 2 channels at the same time, or watch one recorded program whilst recording another?

Sorry if the questions are dumb but just need to know the little things before my brain melts.

Thanks in advance.

Tat. :)