Leetsauce is definitely worth checking out. Although warp is allowed, you by no means have to use it. It is fair to note that you can only solo to a certain point (and this is a point far after hitting level 80). To me, once you hit the last 3 endgame zones (at the moment) you can no longer solo (aka HC VT, HC ST, HC ToV). The normal versions of these zones are also accessible and can be soloed if you wanted to.
There are solo folks who group up and do this content though, especially if you join a guild (I highly recommend Revan's 'The Goonies' if he'll take you and they suit you, they have quite an army now!). I'm firmly believe that with a lot of work certain classes could solo into VT at least, and if you guild up and/or grab rot loots there's the potential you could go further.
Just keep in mind it's a currency based server. If you're willing to put the time in AAing/farming drops (almost everything non-HC is tradeable, even non-kerafym HC ST drops are tradeable) you can work your way through quite a bit of things. And there are so many more farming options now than when we first opened! They've really put in a ton of work developing the server, including custom 3.0/3.5 epics/augs and custom gear from the HC content.
I've truly enjoyed my time there and the GMs are far more active than any server i've ever seen, and the player base is beyond willing to help folks out.
If you decide to check it out and have any questions or problems just use /ooc, i'm certain folks will help you out.
Or send me a tell on Funkeey / Kapow and i'll do my best.
-Kapow