Here's my .02...
I'll assume that you don't have buckets of money to throw at this and that this car is for the street (with maybe an occasional autocross or track event). If those assumptions are correct, then I'd say go with front discs - you don't need rear disc brakes unless you want them for the "cool" factor or actually race your car (the occasional open track event or autocross does not consistute racing in this example). I have 4 wheel discs and I run open track events several times a year - if I was doing this again, I'd go front disc/rear drum and save the money for something else.
Ok, moving right along, I'd say that Stainless Steel Brake Corp is probably the best choice for most street conversions (again, unless you've got money to throw at it). They've been making these kits for many years and have it down pat (I believe their kit includes just about everything you need to make the conversion, which is a big plus). They have multiple levels, from GT replacements to track-worthy kits. Several of my friends who drive Open Track with me have SSBC brakes and they perform very well, even on the track.
Other options include the Granada conversion (good if you are short on money, but have time to find the components). Baer (good brakes, great looking, but can be expensive). Wilwood (which I have) are supposed to be track only (not legal for the street). The Wilwoods are also more work to maintain (at least for me - send me a PM if you want details). As far as I know, all of the aftermarket kits I mentioned can be used with your stock spindles.
There you have it: my free opinion - worth every penny!!