I would totally make Titamon
Nah though, I kinda suck in this game For now...
Anyway, in all seriousness I think you should work on Larva. For caps, I've seen people say 8-5-3 (8th Trial, 5th Island, 3rd Stage) is best for farming Large Dark Caps. At the same time, you can farm for Large Holy Caps for making the SP Seraphi, SlashAngemon, Shakamon.
Alternatively you could do 8-3-3 to get Large Dark Caps (for Larva) and also Large Red Caps. Large Red Caps to make Ouryu from Hisyaryu (Flash Event), ZekeGreymon (with Arbormon), and the SP BanchoLeomon (for this one, just wait for an event with Panjyamon comes around to minimize effort and caps)
Another suggestion is to farm Large Dark Caps from 8-5-3 and you also get Holy Caps (previously mentioned above). Only repeating this one again because you get Large Red Caps from Cerberumon Hard Stage (Aegiomon Trial) as well and Cerber would be good for any team. Though you could go with either Ceres or Cerber, I would say Cerber because its Defense and HP stats are just slightly better than Ceres and Cerber being a Dark Race means it has no resistances. That's your preference though...
However be warned that the boss Cerber on Hard Stage hits like a truck so that might have to come when you're bulklier.. (Seriously hits for 3k+ damage, also doesn't help that Aegiomons stats just make your team worse all around :\ )
It's really up to you though. Yeesh, I need a drink from typin all that... If you have any questions, feel free to let me (or any of us) know