A lot depends on the kind of stories you are looking for. British titles being weekly anthologies for the most part means that writers really did try all sorts of concepts, some of which worked better than others. Some titles were complete mixes of story types, others focused more on humour strips, others more on adventure tales. There were also themed titles (2000AD is an example of this - one of the SF themed titles), with the basic theme being things like war stories (Battle), sporting (Score, Scorcher, Roy of the Rovers), girls comics (Jinty, Sally, Misty), etc. However, within those themes, you'd find quite a mix of stuff, as they didn't want the stories to be too similar.
There's a decent list of what has ended up with Rebellion here:
http://downthetubes.net/?p=33494
For my personal money, and starting with a few stories either already available in reprint or due soon:
Charley's War - from Battle, written by Pat Mills (Slaine, ABC Warriors, Nemesis, etc.) and drawn by the incomparable Joe Colquhoun (not so well known in the US, so I'll let some of his art speak for itself)
Attachment 39466 The story of a World War I soldier in the trenches of Europe, a tale that ran for seven years in the comic and covered the conflict from pretty much the start right to the finish. At times incredibly bleak
Attachment 39467, it's widely considered one of the greatest stories ever produced in British comics, and thus it has been one of the few stories outside of the 2000AD canon to remain available in reprints.
Monster - from Scream, a horror-themed title of the 1980s. Recently reprinted by Rebellion, written by Alan Moore and John (Judge Dredd) Wagner. This article covers it better than I could
https://www.theguardian.com/books/20...riginal-panels
Anything from Action - this was a title that came out a couple of years prior to 2000AD, and without which 2000AD might not have existed.
http://downthetubes.net/?page_id=33280 It was considered so violent and visceral that questions got asked about it in the British parliament, and famously one issue got banned
http://downthetubes.net/?p=22473.
Black Max - from Thunder. Black Max is the villainous star, a World War I German scientist and flying ace, who has created a special weapon to dominate the air with - giant bats powerful enough to down planes.
Attachment 39471 If they do release this one, they could do worse than get Christ Weston to do a cover, given this commission he did for a fan site a few years ago.
http://i2.wp.com/downthetubes.net/wp...size=618%2C927
I could literally spend all day suggesting strips - there are loads of them worth checking out. But the above are decent places to start, and I'll leave it for the moment for others to make their own suggestions.
One last bit, following up on
While I was hunting out the above links, I spotted the following quotes:
In the article about Monster: “Finding good quality copies of Scream! has been difficult as the original film of the story has long since disappeared, but we have substantial experience with 2000 AD collections of restoring neglected comics back to how they looked in the 1970s and 80s,” said Molcher.
In the article about Action's banned issue: "IPC later destroyed all the file copies of every issue, leaving only a scant few in the hands of the comps list."