Just put our server back up, and looking for some additional folks.
We use a custom modpack, similar in theme to FTB, but with an emphasis on closing most of the 'easy' ways to accomplish things. For example, our 1.5.2 iteration had Thermal Expansion, but tesseracts were disabled, so pumping nether lava for geothermal power became less trivial. With this iteration of the server, fewer such paths are obvious, but that may change in the future. The 'hardmode' part mostly comes into play where GT recipes are enabled for everything that has them, and anything that we feel is too cheap for what it does is somehow nerfed.
Abbreviated mod list:
-> IC2-Experimental
-> GregTech
-> BC4
-> TC4
-> MFR
-> Forestry
-> Railcraft
-> Applied Energistics
-> EnderIO
-> SGCraft (STARGATES!)
-> More, and open to requests from players.
Server is professionally hosted in a datacenter, so no lag (at least until the world gets very populated, as is the norm with tech mod servers). We have a patcher, so you don't need to keep track of updates yourself. VOIP is also available.
PVP is on, but deliberate griefing gets you banhammered. Admins are active on the server, but don't use op to cheat. The only rules are 1) Don't be a jerk, 2) Don't do things that harm server performance, 3) Don't whine.
If you'd like to be whitelisted, post here or PM me with your IGN, confirmation that you are over 18, and that you understand the last paragraph. I will PM connection info to those who are added to the whitelist. We use a patcher which is not publically posted to comply with the licensing terms of some of the included mods.