Depends on your local site, in my opinion. For me, DMRs are useless at Worthing, as 1.6J with a 30m MED just isn't worth it; even if you want to play marksman you're better off with a bolt action since 2.3J will get you significant range increases and the MED is the same at 30m (and it's incredibly thick with foliage 6 months of the year, making snipers useless too). Different sites tend to have different rules for DMRs and I've written basically a thesis on it in another thread on this forum somewhere since I used my m21 setup to experiment with different powers (HPA is useful like that), but TL

R is this:
1.48J - totally useless. Stay at 1.1J for no MED. I saw no noticeable difference in effective range.
1.64J - mostly useless. Maybe consider if your local site is fairly open and your MED is only 20m. Even then I only really saw a difference of about 5m effective range over 1.1J.
1.88J - enough to be useful. Probably wouldn't consider with a 30m MED as I have a bolt action with a 30m MED at 2.3J and an effortless bolt pull so I can shoot it fairly fast (still might though) but would go for it with a 20m MED easy. Saw enough of a boost in effective range to make it worthwhile.
As a result of Worthing's DMR rules being craptastic, I've long since been honing the idea of a 1.1J "semi-auto sniper" build myself; the goal was to get the most range, consistency and silence while having no MED by keeping to 1.1J. I managed around 65m effective range (at least 9/10 shots hitting a man-sized target) and I find it to be more than enough for most engagements, though Worthing is not a very sniper rifle friendly site even in winter (but it's way better than the woodland CQB of summer). I am a big advocate of the 1.1J DMR/Sniper build and think they're underestimated in the airsoft community for just how savage they can be. Plus people moaning "that's a bit close for a sniper/DMR" is always amusing.
Now that I've rambled enough, I'll actually get to my recommendation. Pick up your DMR rifle of choice, whether it's a Cyma m14 (they're nice...), SR-25 or something else. Then don't touch the gearbox, leave it at 1J and pick up a new hop rubber (I like 70 degree maple leaf macarons for AEG style rubbers), hop up nub and if you've got the cash a new inner barrel. Then simply play like a DMR as
@Tackle suggested and see if you like the play style and get a feel for how much an MED might inconvenience you; remain mindful of your shots and the distances you're typically shooting at and experiment. Maybe play a game where you shoot only at targets over 20/30m, depending on the DMR MED at your site, then play the next game with no such limitation and see which you prefer. However, I will refute his point that they're 100% compatible and say they're about 95% compatible. There are tiny tolerances that are different, though you'll only encounter them if you work extensively on it. For example, TM magazines will fit in a Cyma m14, but they're really, REALLY picky about how you put them in and if you don't put them in right they'll fall out, while Cyma magazines in a TM will need to be forced in a little. Also, a Cyma stock won't fit on a TM gearbox and upper receiver. How do I know? Because I have both a Cyma and TM m14 and have discovered these while working on them