Hi George!
You ask a very good question that has no universal answer!
Put simply, the very "best" bicycle is the one that is best for you, and best suited for a particular purpose or the way you intend to ride most often. There's no single correct answer for everyone! Each bicycle is a compromise to a degree, but it is possible to select one that is nearly perfect if you choose carefully. Of course, there is a whole universe of bicycle brands and models to choose from. Many are good, even outstanding for any number of reasons. Getting the "right" one for you can take a little care in selection.
This being the Thorn Cycles Forum, you'll overwhelmingly receive the answer "Thorn is the best
brand!" simply because we have that interest -- and brand -- in common. Thorn make a variety of bicycles to fit any number of needs. If you haven't yet visited, I suggest you take a look at Thorn's models home page, here:
http://www.thorncycles.co.uk/models.htmlEach model in the current Thorn lineup has its own downloadable/viewable brochure, and Andy Blance (Thorn's designer) has really gone all-out in carefully describing the advantages of each as well as indicating their suitability for purpose.
Surely, with such a grand selection, you'll find something that appeals. A Thorn bicycle is the "perfect" bicycle for many of the Forum members here!
You are already doing the "other" important thing in making a selection -- asking others for their opinions. Among the Forum members, you'll find the entire Thorn range well-represented, and the helpful membership will no doubt weigh in with their own recommendations based on personal experience.
Now, you can help us help you by telling us a bit more about what you're seeking...
= What kind of riding will you do the majority of your use?
= Do you like to tour? If so, how big will your loads be, and how far/frequent your tours? Mostly on-road, or on tow paths, old railroad lines, into the rough-stuff, or truly off-road? Perhaps a mix of all these?
= Will you commute daily on your new bicycle?
= Are you a fast rider, or do you like to poke around and enjoy the scenery more than making distance at speed?
= What kind of bicycle do you own now, and how is it lacking? What features or capabilities do you wish it had?
All these things will help you better define your needs and help us help you with suggestions and ideas. Thorn make models from fast, lightweight randonneurs (the Audax) to traditional tourers (Club Tour), touring/camping bikes (Sherpa and Raven), and heavy expedition tourers (Nomad). There's a derailleur-based MTB in the lineup (Ripio), a tandem, even a triplet. There's choices between drop handlebars and some variety of straight handlebar, and there's two different drivetrains -- derailleurs or Rohloff internally-geared hubs -- with frames optimized for each of these.
A thumbnail sketch of the entire line is available here:
http://www.sjscycles.com/thornpdf/ThornModelOverviewHiRes.pdfAt this point, I'd suggest downloading and reading each of the brochures, and also spending a little time looking at Thorn's setup guide to get an idea what positions are possible; a copy is available here:
http://www.thorncycles.co.uk/models.htmlHopefully, something in the above will help you find what you're seeking.
Best,
Dan.