Does anyone else find that, as capital ships go, the current ones don't really seem to fit the bill? Now, I know nothing about spaceship lore (or even naval warships) but... When I hear capital/flagship, I think of something like a Super Star Destroyer. Can we add -actual- capital ships?

Eve Online has an interesting system in that they have (in order from smallest to largest) frigates, cruisers, battlecruisers, battleships, then capital ships: carriers, dreadnoughts and titans. Everything is pretty much as it sounds:
dreadnoughts are siege vessels: not the best against smaller ships but best at demolishing structures and other cap ships.
Carriers: Duh.
Titans are naturally the omgwtfpwned ships with their ridiculous defenses and huge AoE attack (aka doomsday weapon).

Im not saying 'hey lets turn sins into eve', but can we follow their ship classification a little bit?

In my opinion, I think the current cap ships make for beautiful Battleships or Battlecruisers. However, can we make ships that dwarf the current ones? Mmmmmm nothing would make me quiver more than watching a -giant- ship warp into a system and start punishing people.

Dreadnoughts could replace the siege ship class altogether since (as I understand it) theyre not used too much anyhow (ugh thatd be sexy to see a giant ship wreck a planet with huge missiles, artillery or beams). I dont think it makes much sense how the current cap ships can deal so much damage to the planets. The ships themselves just dont seem to be big enough to deal sufficient surface damage.

Carriers could actually field more fighters than the current ones. They should have no weapons but perhaps have handy repair abilities or something.

We dont even need to incorporate a Titan-type vessel unless someone wanted to spend alot of time balancing the thing.

God dammit, I wanna see some giant ships with big flashy weapons!

Edit:
http://smg.photobucket.com/albums/v256/dylanmania/?action=view¤t=EveScaleSheet-1.jpg
I uploaded an Eve ship scale sheet to give people an idea of what I mean when I say dwarfing other ships You can't even see a frigate on the image because these ships are so gigantic. Cruisers (which I presume just about every Sins ship to be) are sooorta visible, but battleships (our current capital ships) are basically the smallest visible ships... But looking at this shet, Its very easy to see a dreadnought sized ship (the second largest ships generally) absolutely ruining a planet or installation in space. Lord I hope a ship that size is introduced.