Love my Pioneer A04 with a 2X4all hacked firmware. Burns like a champ for my v5, Apex DVD Players--even my brothers 2 yr. old JVC likes them--and I've been using the cheapo 2X certified medias--LeadTek, TDK Clones, Accu's. So far no problems.
Regardless what drive and media you use, make sure to test scan them to find the best burning speed first. There's a sticky up top about a testing utility.
Sony's were popular because of the multi-format options, but there are a lot of those out now--even Lite-On has one. A solid DVD-R capable drive is what you need for that v1 though, so I'd save the cash and nab a straight -R drive and hang on to the extra $$ for media or the possibility of upgrading/updating the v1 to something with a newer drive unit if it has trouble with the backups.
My 2 cents...
If it ain't broke don't try to fix it! But, hell if you can tweak that bastard just a little bit more....hehehe.