Victory smite is pretty terrible and I wouldn't recommend spamming it. I'm not certain about solo with trusts since I don't do that at all, but when buffed up, MNK can do much better with long skillchains. Even for WS spamming, WS like howling fist, raging fists, and kick WS like dragon and tornado kick will significantly outperform victory smite.
Smite is OK under impetus with decent stacks, but even then it's really not the strongest WS most of the time.
That said, in terms of weapons I'd say get Karambit to start, then ideally you'd get Godhands. Since you said it's not possible (might be, try networking and/or forming a group yourself), I'd get Verethragna. They're very strong and can still perform very well, offering a significant boost over Karambit.
Finally, regarding Varga: I've never owned them, but from what I've heard they're quite strong, both with Maru Kala and also with smite or other WS. The triple damage procs and PDL, plus the new SC options, make them very interesting and competitive DPS-wise. Though, and this is not to be underestimated: getting a stage 4 (or 5) prime weapons takes A LONG TIME. Especially as someone who isn't established and doesn't have a static group...it's frankly not realistic. I wouldn't put your eggs in that basket until much later in your ffxi career/adventure/experience. Focus on the here-and-now first.
