Hey man! Glad to hear you chose a more deliberate approach! It will pay off huge in the long run!
...and how long will I be able to get by without a sub or two (my goal is two integrated)...
The answer here is: as long as you'd like. Cryptic? Maybe. *shrugs If you choose good speakers, you will really only be missing out on less than an octave of audible frequencies. If you choose the right speaker, maybe less!
I was very interested in Emotiva, I ultimately chose not to pursue them because I knew I could find better to suit
my needs and desires for audio gear. There are some good reviews for them, and people that like them, seem to really like them. That said, I've also seen some talk about turnover in their product line being quick, as in they don't necessarily keep models around for long before killing them off. Maybe they are innovating new gear, which would be good... maybe not.
I have been recommended to listen to Golden Ear a lot. I haven't seen anything bad about them in my research. I have no other experience with them. Krikey though, if you can look at Triton Ones @ 3K a piece, you can look at a lot of speakers!
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Of the SVS Ultras, again, no first hand experience, but again, good reviews and seldom have I heard anything of significance that would say NO. I think I also recommended SVS to you for the ease of shopping wih them and their return policy.
Of those three, if you don't consider any others and don't mind rolling the dice on time alone, SVS would give you the easiest opportunity to bring in and audition! You will have to pay to return Emo... Presumably Golden Ear.
PSB Imagine X2T are supposed to be good speakers, and they have a matching center which will fit your HT plans in the long run.
But for bass response with out subs in the short term, you get best from Golden Ear One (13Hz claimed) or Two (16Hz claimed), then SVS Ultra Tower (28Hz). That PSB is 30Hz on the low end.
Good choices there if you ask me.