The best advice is to skip JWalker entirely. Those are blends and most seasoned scotch drinkers prefer single malts. I myself enjoy the Gold and Blue but generally speaking, JWalker is looked down upon.
If you know what they drink life becomes easier because you might be able to take some risks with some really interesting picks. But if you don't know what they like then you need to play it safer. You don't want to get anything real smokey and/or peaty.
Here are my recommendations:
Balvenie Single Barrel - $87
This is probably your safest all around bet: It's right in your price range, it's a "safe" scotch (not smokey/peaty), and can be appreciated by just about any scotch enthusiast who doesn't solely prefer super-smokey selections.
Talisker 10 - $60
This is a riskier pick, but if they're true enthusiasts (and not just a couple old guys who always drink Glenlivet 12 and call themselves enthusiasts) then they'll appreciate this. Nothing says "I know wtf I'm doing" like giving a true enthusiast a bottle of Talisker. It's a little under the range you quoted, but it's a damn smart choice. It's got more bite but it's a huge favorite. To the uninitiated, they'll see "10 year" and think it's worse than a 12 or a 15, which is ignorant. That's why you need to know exactly who you're buying for
One option with this, if you want to hit your $80 price point, is to also get a set of
4 Glencairn Whisky Glasses. These are EXCELLENT scotch glasses and any enthusiast will appreciate them, even if they already own some. They're somewhat fragile and it's always nice to have more to share and as back-up
Highland Park 15 - $90
If you want to impress them beyond the Balvenie but not take the risk of the Talisker, the Highland Park 15 is your boy. This will be out of your price range in most stores (it can sell for as much as $150), but there are places - like on this site - where it's reasonable. This is an EXCELLENT scotch. There is a downside however: there have been batches of this since around May that haven't been up to snuff. HP has acknowledged this and will exchange bottles if needed (I believe). I don't think it's a prevalent problem and have not encountered it personally, only read about it.
Macallan Fine Oak 15 - $100
This is probably the "safest" pick in the bunch, but it's also the most boring in my opinion. That said, people in generally think very highly of Macallan. Personally I find it to be a bit overrated and "been there done that." Again if they're true enthusiasts, they've had plenty of Macallan over the years. But there's also something to be said for playing it safe when there's no information available. Still, I'd go with the Highland 15 in that scenario rather than the Macallan, but that's a personal choice.
So those are probably my top 4 recommendations. If you know they like JW, then go for a Gold or a Platinum (I've never had the Platinum but I do really like the Gold). But unless you've specifically heard them praise JW, steer clear. These four picks are, for lack of a better term, "rock star" bottles in the scotch world.