No one can decide for you but here's my .02... Both are solid topped models, The martin is HPL (high pressure laminate) back and sides and the epiphone is laminate maple back and sides, so neither are solid wood guitars... 80-85% of tone comes from the top so that's what's really important.
Martins have a distinctive sound that carry (somewhat) over to these models because of the top bracing. So if you want a Martin sound, the Martin is ,of course, the way to go. (Imo) The Martin will hold resale value better and in general they are more consistent in quality and tone.
The Epiphone dove can be a great guitar but they are inconsistent. Some i've played have sounded good and some not so much... If I was going the epiphone route, I'd be sure to try it before I bought it.
Not sure if you want some more ideas or not but here's a few under 5 bills worth consideration... IMO
In no particular order
http://guitars.musiciansfriend.com/prod … sku=582300 and
http://guitars.musiciansfriend.com/prod … sku=582299 These are currently being closed out and are a great deal on a good solid topped and backed acoustic (IMO)
http://guitars.musiciansfriend.com/prod … sku=512120 It's hard to go wrong with a Seagull ,or any other Godin guitar (Simon & Patrick, Art & Lutherie, Norman) One of the best bang for buck brands out there (IMO
http://guitars.musiciansfriend.com/prod … sku=519049 These Yamahas are great as well for the money... Especially with a upgrade to bone for the saddle.. They have a taylorisk sound without the cost.
That's just a few but if you want more, I can go on... Best of luck in your search! -Pix