I'm really not a fan of the Chantodo's wand. I happen to think they are far overpriced and I prefer to get my APoC from OH and helm. Then I go for a socket on my weapon, making sure to get one with all physical damage to increase gains from items such as Zunimassa's Trail, Storm Crow, Triumvirate, and Tal Amulet (though until I get an amulet with crit, I'll probably stick with the lame Int/vit/resist/armor/crit amulet I have). If you replaced your weapon, you could change your OH to a Triumvirate and should gain a lot of dps, though you'd lose the vit from your current OH and likely lose the int from your weapon. You can also swap to a Storm Crow for pretty cheap, though losing the crit is annoying. If you do I'd recommend getting resist on it, unless you go for one with crit.
If it was me, I'd probably do the following. Buy all physical weapon, 1-1.2k, with attack speed and a socket, hopefully spending 10 mil or less. Then spend 5-10 mil on a Triumvirate OH with max APoC, probably getting one with 150-200 average damage. I'd buy a 100% crit damage gem, costs around 5-6 mil, and a Storm Crow with 60-70+ all resist and over 400 LoH for 2 mil or less. With the rest I'd look into buying a pair of Zunimassa's boots with high int (170+), 8% poison damage, and as much EHP as I could afford between +armor and vit.
You can also try to replace your bracers with something having 140+ int, 4.5%+ crit, high resist and bonus armor, but I wouldn't spend more than 1-2 mil on them tops since it's not much of an upgrade.
Also, the one thing I would definitely do is use a spreadsheet of web app to compare gear and stats before you buy, that way you can be sure you're getting the most out of your gold. I recommend the spreadsheet on this site because I wrote it but others should work well. Either way make sure you fully understand how to use it and that it is giving you the correct values before making any purchases. Otherwise those are my main suggestions, so use them as you like.
You need more APoC. One item with 6 definitely isn't enough. I recommend either Storm Crow or offhand. If you don't plan to replace your weapon anytime soon, you'd probably get more dps out of Chanto OH than Triumvirate, but that will probably cost quite a bit.
Your necklace and chest seem pretty weak. I'd try to get an amulet with Int, higher crit, and then either extra EHP via some combination of resist/vit/armor or more dps via bonus damage/crit damage/attack speed/more int. For chest you can try getting a Tal chest if you want, and aim for one with armor, for a decent dps boost. With similar vit on it you will also gain EHP since your current chest is pretty low for EHP. Otherwise you can just look at rare chests with about same int/vit but with resist and/or armor, but I have no idea what the prices of those will be. Other than that I'd recommend upping your resists and/or armor a bit more as you upgrade your other pieces. That should allow you to run higher MP levels, though with your current gear MP5-6 should be doable, but with the dps something like MP3-4 would probably be more ideal for farming efficiency. I've got around 460 resist from gear for a total of just under 700 before prismatic armor and 4400 armor before energy armor and it works great for MP7 uber bosses in a group as well as solo key farming. I still prefer Archon for xp farming though, even at MP2.