I mainly use Sonic Foundry Sound Forge (Sonic Foundry was recently acquired by Sony) but other high-end contenders are Adobe Audition (was Syntrillium Cool Edit Pro) and Steinberg WaveLab (can't remember who bought out Steinberg - Pinnacle?).
I'd have to say
Adobe Audition ($299.00 US) has the most bang for the buck. Besides being an excellent multi-track recorder/mixer for original music projects, remixes and video soundtrack editing/mixing, etc., it's also a decent 2 track editor, with noise reduction plug-ins already included.
Sound Forge ($399.96 US) and
WaveLab are dedicated 2 track editors with a few more functions than Audition's built-in 2 track editor, but you have to purchase noise reduction plug-ins separately. WaveLab has a semi multi-track capability with it's "Audio Montage" feature, but is quite pricey (was $599.99 in 2002). There's also a "WaveLab Essential" for about 1/2 the price.
While looking up weblinks for this reply I also came across something new: Sony
Screen Blast Sound Forge which may be ideally suited to your needs. It's only $69.95 US and includes the Express FX Vinyl Restoration plug-in. I haven't used it but it appears to be built on the Sound Forge core/engine. As I said in the beginning, I use Sound Forge the most... mainly because it's the easiest to get around in and has very good Online Help.