I made my Fox 2143 when I first started trickster before I really even knew that much all about the differences in builds and such. I've personally not had any problems with having gone 2143, and as you get higher and higher in level, the difference between that 3 and 4 charm becomes less and less as well, because of all the DP/HP/HV possible equipment that is coming around and being able to be used with DA equips as well.
A few examples:
GMV, Obvious, it's a huge HP booster that is now extremely common for the moment.
Bruce Lie, +18 DA/LK/HV/AC, +1008 HP. Killer pet!
Music (Xeno), Teacher (Tsun), Planet (Mercury), pets are also all good AC/DA/LK pets, but their HP is a bit lacking and they give no HV compared to Bruce ^^
Golden Lion Sword: +8 HV/DA
Golden Lion Shield: 119 DP
Pop Pendant, largely HP compable, moderate HP/DA/HV boosts
Melon/Strawberry/ChocoAlmond, all really really kickass HP equipment for their levels
Suitcase Shield 170, the only reason I bought a couple Love Boxes, the shield I got was: (And keep in mind the HP/DP/HV here is about 50% of what their possible maxes are for this Shield o.O) DP 345 (now at 407 at lv 2 refine), 1115 HP, 18 (+21 comp) DA, 12 HV, and even 243 MD. The HP/HV on this shield are about 100 levels worth of 1 Charm point, little more I think in fact.. (As at lv 161 w/ 3 Charm I have 3720 HP, meaning if I'd had a 4 Charm, I'd have had 4960 HP. 3720/3+3720 for that equation. The HP per point of charm from 161 levels is 1240, so 1115 HP is like 150 levels worth of a single point of Charm.. And I have 30 base HV..) the DP however is much higher than just 150 levels worth o.o it's like the whole 400 levels worth, unrefined o.O
As to my 2 in Power. At 161 I've got a base of 70 AC. Using the calculation for that, a 1144 at the same level would have a base of 60 AC, now yeah, using AC equip could make up for the 10 AC, but I'd rather simply wear even more DA equip! And Gun Booster would be possible to make up for it as well yeah, but then again.. I'd rather not waste the 25 TM or whatever it is x.X
I'd say you need probably around 80-85 AC from my experience to be able to reliably hit most things that you'll be training on from 100+, at level 100 as 1144 you'll have a base of 56 AC, so that's +30 AC you need to get to really make sure that you don't miss a lot, a good myshop AC pet can make up most of that, but then there's still like 10 AC more you need... And if you don't have/don't want to use Myshop, you're gonna be even more hard-pressed on AC and that 2 in Power for that *little* +6 bonus might just be enough to separate a hit from a miss.
By the way, not only is a 2 in Power actually good and in some people's opinions worthwhile for the extra AC for the sacrifice of defense, but it's actually twice as fast of growth as a 1 in power, when you think about it that way that makes it uber :P
Also ... It's better to hit your opponent on the 3rd try after 2 misses than hitting your opponent on the 5th try after 4 misses, that *little* bit more amount of HV definetly won't cover you, (it's the same as the amount of difference of AC by the way, so a 4 Charm at level 100 will only have 6 HV more than a 3 Charm.), the DP for sure won't cover you (it'll be 108 more DP, which isn't *bad* but it's surely not extreme either compared to what simply wearing good equip will do for you.), the HP difference will be 750 at level 100, which sounds pretty good.. but you consider that's .. what? 2 hits or so from mobs, if not less? Better to hit on the 3rd try than the 5th try as I said...