Just my two cents...
Either of these would be a great rifle, both are very well made, and affordably priced.
This is a Traditions 50 Cal Hawkin Rifle... for $425.25
http://www.dixiegunworks.com/product_info.php?cPath=22_92_186_190&products_id=12454
This next one is a Traditions 50 Cal. Tennessee Short Carbine, another excellant value at $465.25
http://www.dixiegunworks.com/product_info.php?cPath=22_92_186_190&products_id=12448
I suggest these two rifles, because you stated a need for accuracy, and both of these rifles have double set triggers, allowing for a very precise trigger pull, they can be easily outfitted with a number of different traditional styles of long tube scopes...
http://www.dixiegunworks.com/default.php?cPath=22_129_647
Or, precision calibrated rear sights.
http://www.dixiegunworks.com/default.php?cPath=22_129_651_653
Don't shy away from flinters, just because some people think they are "pesky" or "finicky". They really aren't any less reliable than percussion cap ignition guns are. If, someone is having difficulties with their flinter, this would indicate some sort of problem, either with an improperly sized flint, a dulled flint, an improperly mounted flint, or, possibly with improper tempering of the frizzen (Striker), or misaligned geometry between the frizzen and the flint hammer. Alot of inexpensive flint guns out there will delliver a flinter that is in need of "tuning". Basically what this means is that the flint hammer geometry needs to be checked, and the flint hammer may need to be heated and gently bent slightly, this way or that, to allign it properly with the frizzen during it's travel path, or, that the frizzen itself needs proper heat treatment... Neither of these things are not that difficult to do, and any competant gunsmith who has knowlege of flintlocks can perform these services for rather nominal fees.
A properly alligned and tempered flintlock should spark easily, profusely, and ignite the priming powder quickly and reliably. Indeed, a "Test" of a good flintlock mechanism is to fire the gun upside down, a properly tuned and tempered flintlock will ignite the barrel charge even from an upside down position !!!
At any rate, once you have selected your rifle, you will undoubedly need all the gizmos and do-dads to go with it, all the "possibles" as they are called, and, of course, some kind of a bag to carry them around with you, a "possibles bag". By the time you fill up your possibles bag, with ball and bullet bags, a flint pouch, patches, ball lube, a powder flask/horn, powder measure, priming pan powder dispenser, short starter, palm saver, small leather mallet, various small tools for your ramrod, and of course, your flints or caps, your powders, your balls and bullets... et all... You will find that you will have spent nearly as much on all that stuff as you did on either of the above two rifles... LOL... Such is life !!! (And of course, MORE, if you start casting your own balls and bullets.)
Like I said, just my two cents... Have FUN with it !!!
Sincerely,
ElvinWarrior... aka... David, "EW"