Mastermindzz,
depends on what the cost is on that used gear. Hell, for
new prices you can still come up nicer than that Triton joint you mentioned. If you don't own a sampler, the MPC + a sound module will do you justice. If you do own a sampler, then I'd suggest that used Motif and probably the Mo Phatt unit. I see that Rev E. recommended against the Emu box, but it'll be hella useful, if not for the particular project you mentioned, then surely for your R&B (and other hip-hop) projects. It's kind of a common box, but still useful, nonetheless. I think the Motif will serve you better than the Triton, and though stuff like
the Micro Q is quite a cool unit itself, for your uses, until you become more familiar with boards and stuff, I'd suggest holding off on a piece like that.
The old analog joints like the Juno will mos def do you justice, especially for bass sounds (layer 'em with whatever other box you get), but you may feel limited and get similar effects from other gear combinations.
Maybe you should look at the DBX subharmonic synth, it's a motherfucker for fattening up bass sounds, though it basically has to be used along with another bass sound. What it does is drop & play your bassline an octave with a low pass filter on it - I refer to it as "the rumble factor." It lists for about $300.00 new, and you can surely get it for a bit less. I'm really, literally, feeling this box (as is everybody else who bumps my shit in the clubs, cars, etc - it's pure-d-gold for the subwoofer set, I think).
The Korg MS2000 or 2000r is a cool piece of gear for about $400.00 for the rack version. Analog stylee bass sounds as well as whatever else you can coax out of it. I'd love to have one, but I keep spending loot on other shit. Maybe for my birthday...
Maybe if you told us what gear you already have, we could better help you make a decision.
<I might even lean towards a Yamaha RS7000 over the MPC, ask if you wanna know why...>
Either way, I'm gonna chime in with everybody else and say that 3gs is better spent on stuff other than that Triton studio.
Good luck
Flo' Dolo