Staying on topic....
They are very impressive! Do you find the Typhoon land speeder effective? It's only 25 more points compared to the original land speeder but having 2 extra missile launchers is pretty good. Is it worth the points or should i just take the 50 points landspeeder?
Emperor's Champion is one of the reasons why i play black templars. I usually take the champ and a chap or champ and a high marshal. Marshal's pricey but he's a really tough guy. Do you find our dreadnaught effective? He's really slow, too slow for my army. I like having all my guys in tanks and assault guys. Dreadnaught just can't do it, he moves 6! His strength 10 is pretty impressive against other enemy tanks.
I like the Typhoon becuase it's nimble enough to redeploy mid-game, plus it's 48" range comes in handy for coving fire. However
you must remember that a Typhoons missile launcers are twin-linked, and that they're not standard missiles (i.e. no Krak) so the Typhoon is most defiantely an infantry hunter.
Dreadnaughts are tricky. I tend to play against Chaos a lot so I don't take them (anymore) as they're Lascannon fodder. But again it's what you want to do - give a Dread twin-Lascannons and the Missile Launcher and you've got more firepower than a Typhoon (for example) but you lose the mobility (and you double the cost). The other real option - an assault based one suffers from its speed (as you've said), but if you really want a dread try giving it a CCW with Heavy Flamer and Twin-linked Autocannons (curtosy of Forge World). That way it has some ranged firepower to play with while it moves up the board into assault range, but you don't get side-tracked into using it as fire support (you'd probably do this if you gave it Lascannons over Autocannons).
Dreadnaught are good in one particular aspect though - CITYFIGHT! In my Cityfight army I have both a Dread with CCW, Heavy Flamer and Assault Cannon and a Vindicator (totally rules). In the close confines their range problems suddenly disappear, and the dread excels in assault - especially if he's backed up with a BT squad.