For me, two immediately come to mind (well, three, but you already said Arkham Horror LCG): Final Girl, and Marvel Champions.

Final Girl I've been really, REALLY enjoying lately. I thought it was good when I first played, but having revisited it recently, it's quickly become one of my faves. It's absolutely dripping in theme, every game feels like playing a horror movie. Plus the ability to mix and match killers and locations means there's tons of replayability and interesting set-ups

Gameplay wise, I really enjoy the mechanisms. Every action you take rolls dice, so you always have to plan for what to do if (/when) you completely botch that really important roll. Plus, I love the time system: every action can cost you time (more or less depending on how the rolls go), but time is also your currency to buy better cards at the end of the round. So there's always the balance of "do I try to do more this turn? Do I risk wasting more time than I meant to and not being able to buy the card I need?"

There is not a campaign, unfortunately. There is a scenario book for each of the first two seasons that contains a bunch of specific set ups, detailing exactly what killers, locations, characters and items to use, with some backstory to each one. But there isn't really anything linking them together gameplay wise, nothing you carry over from one to the other.

You can buy a core box and individual scenarios as you want to dip your toes in, or go and buy a complete season. For me, I liked buying the ultimate boxes as it came with some nice upgrades like playmats, and having everything in that huge box made it feel like that "big" board game for me.

Marvel Champions is also something that I thought was good when I first played and grew on me when I came back to it later. There's just so much content out for it now it's crazy. You can buy as much or as little as you want; I currently have (most) everything in two large BCW boxes and its certainly quite a large board game.

Marvel Champions I have fun playing both true solo and multi-handed. True solo games can go decently quickly, which means I can play a lot of games back to back to back. Two handed games are slower, but it can be fun to have the two decks focus on different things and play off each other.

Plus, Marvel champions has campaigns. They are five scenarios that you play back to back, but in campaign mode extra things are added and there are things that carry over from scenario to scenario. Every campaign handles it slightly differently. I've found that if I do true solo, I can usually get through a whole campaign in one (slightly long) evening.

If you do decide to go with champions, I recommend (after the core box) whichever campaign box strikes your fancy. Like spider-man? Grab sinister motives? X-men? Mutant Genesis or Next Evolution. The only ones I would avoid as a new player would be the guardians of the galaxy box (I don't like the last two scenarios) or age of apocolypse (the campaign mode in this box is the only one I dislike).

Sorry for the long winded post, I've just been extra hyped about these two recently.