Hey there @Armanbai.
1) Regarding your first question, Modular Powersuits has been updated to Minecraft Version 1.10.2. Aside from that, I have yet to find any really great armor short of Draconic Evolution (Redstone Arsenal adds armor, but I don't believe it to be very upgradable).
2) As for multiplayer on servers and such, I would recommend the Twitch App. If you are looking for servers, the FTB packs are probably your best bet (The twitch app has their own section for these packs). When I want to play on a modded server I usually play on Shadownode, but I am sure there are plenty of other options out there.
4) Redstone Arsenal adds powered tools, as does Mechanism, and several other tech mods. Actually Additions is a great tech mod that is new to the later versions of Minecraft. It adds a drill for 3 by 3 to 5 by 5 mining (or digging), along with upgrades for fortune, speed, and the like. Simply Jetpacks has also been updated to the later versions of Minecraft, and as always, Tinkers is very op for easy tools and weapons (The slime boots and slimesling allow for a very nice early game form of travel as well).
5) Well, first off, Actually Additions (Which I mentioned in #4) for tech stuff along with Flux Networks for wireless energy transport. Extra Utilities 2, while very different from the original, is still a very fun mod (See the Rainbow Generator). Draconic Evolution is great and Deep Resonance is interesting (although I haven't used it much myself). If you like programming (fairly basic unless you get way into it) PSI is a great mod that has tons of potential. Finally, Immersive Engineering (Tech) and Industrial Foregoing (A MFR port) are also very good mods. As for agriculture, Pam's Harvestcraft and Cooking for Blockheads are great for food, and for storage, AE2 is a great tech approach to storing all your items (works great in conjunction with Storage Drawers).
These are just a few of the many great mods found on the later versions of Minecraft.
6) I don't use the crossbow or shuriken much myself. But I find that paper or magma slime limbs produce the best draw speed on a longbow, along with a cobalt plate and lots of redstone. The Tinker's book that you spawn with provides you with all the information you should need regarding material stats and abilities, I find that just flipping through the materials section every once in a while to find the best material works for me.
That's about all I've got. I don't have a lot for you regarding eight and nine. I tend to prefer the huge tech mods (and sometimes magic) with lots to do. Just so that you are aware, Agricraft is still in alpha stages for 1.10 on, and a lot of features are not yet implemented or are bugged. Sprinklers do not yet work, and some of the mod integration has yet to be worked on. I also found that just by putting a crop in crop sticks (1/1/1), it grew significantly faster and produced more drops (as if it were leveled up). Reguarding a "less cheaty Equivilant Exchange" I have yet to find anything of this nature. Project E (A port of Equivilant Exchange 2, and the best form of Equivilant Exchange on the later versions of minecraft at this point in my opinion) does have a configuration that allows you to have some "EMC loss" (i.e. If a log has 16 EMC, "burning it" might only produce 8 or 12 EMC depending on the configuration).
Hope this helped!