I have some ideas for you. Like other ppl said, don't overload your server!
JustWarp is a great warping one. The Warps plugin does add portals aswell as /warp but Just warp only has /warp but it is a lot faster. You don't have to wait.
Multiverse is a good one as you probably know.
If you like creative PlotMe is for the plots and is great but if you are an Edawg fan you may notice it docent have /phome so you may want the phone mod.
By the way, I'm having real trouble getting mcore and factions on my server.. Got any tips?