the stiletto ace is very british and very bright.
the express series doesn't hardly compare to the stiletto series. the cleans are nice, but the overdrive is a bit underwhelming.
the dual caliber is a great amp with good cleans and sweet overdrive (very mark-ish)
I'd get the Express in a head form. It's the only option you listed that has 5 watt capabilities, which means it's the only one that will be close to being apartment safe. FWIW, I found the Express series amps to sound better than the DCs. Different strokes. I'd only get the Ace if you have to have a more British flavor and have a hotplate.
I would suggest the head versions of any Mesa you get. I have the DC-5 and Lonestar Classic heads and have a variety of cabs to go with them. One word of caution: the DC-5 is one seriously loud amp and you are not going to be able to set the master on channel 2 much higher than 2 before the walls shake. It's not an apartment amp if you want any type of overdrive.
I like heads, they use of different speakers really opens up the Mesa IMO, sometimes the combos get that focused thing no matter what you set em on, other cabs seems to let the amp shine. I do a MKI into a Bogner 410 open back that sounds amazing
combos are easier to live with, my mark iv is 85lb but it came with casters, so it rolls easily is well built, heads and cabinets even a 2x12 are a pain to move around need a dolly at least, personally the mark v would be what I would get, the mark iv will take EL-34s like the stileto, but it never was a mashall to my ears, the mark iv with 6v6s is what I am running now, great princeton like tones without the limitations, I also have a fender hot rod deluxe, those are very portable, its getting omega modded right now, should get me close to my mark iv with JJs 6v6s which I have been running for a while and loving