gswitz
RishiS,

For headphones, I bought one of these...

https://smile.amazon.com/...NZpzWCL&ref=plSrch

Yes..im looking at either something like this or an headphone amp with 4 outputs.

RishiS
I am currently facing latency issues with the scarlett 2i2 and also falling short of outputs as I've moved from beginner to intermediate level over the past several years. My main concern with 2i2 has been a significant lag in hearing my own vocals on the headphone while singing to the mic. Direct monitoring is not audible unless i turn the mic gain to its max (which obviously causes clipping). The input echo in sonar is too delayed. So im ending up recording vocals without being able to hear myself on the headphone while singing.
 
So want to get rid of these kind of issues once for all, the best one my researched showed was RME. Also I need more I/O to plug in a second pair of monitors and may be some outboard gear in the future, hence the UCX and not the Babyface. UFX would have been ideal (coz i need 2 headphone outs as well) but is out of my budget. I would rather plug in a headphone amp for much lesser cost.

If you want to consider a whole new concept, consider a very small cash outlay and stick with your Focusrite Scarlett 2i2. I think from what I've read you could achieve your goals in this less costly way with great success.

$122 for a small mixer with effects (such as reverb and delay). I use this.
https://www.amazon.com/Ya...Yamaha+6+channel+mixer

$35 mic splitter:
https://www.amazon.com/AR...ds=Microphone+splitter

Maybe another $20 for an additional short mic cable or two if you don 't have them.

Plug your mic into the splitter. One cable from the splitter goes in the 2i2, the other into the mixer. Headphone out from the 2i2, run a cable from the 2i2 headphone out into one of the mixer channel inputs.

Your headphones plug in to the mixer. On the mixer you can balance the Sonar music playback with your live mic volume to a desired balance, and add effects to your mic that you hear on your headphones (but do not record to Sonar since this is on a split wire that doesn't even route to Sonar).

You can then record into Sonar at a 1024 buffer (if you want to be that ridiculous) and monitor your live singing with absolutely zero latency. It's perfect.

The Focusrite Scarlett 2i2 records clearly into Sonar without a trace of color.

So, yes, you can upgrade to an RME for a hefty price, or you can achieve bliss for about $160.

I know this works.

lawajava

Plug your mic into the splitter. One cable from the splitter goes in the 2i2, the other into the mixer. Headphone out from the 2i2, run a cable from the 2i2 headphone out into one of the mixer channel inputs.

Your headphones plug in to the mixer. On the mixer you can balance the Sonar music playback with your live mic volume to a desired balance, and add effects to your mic that you hear on your headphones (but do not record to Sonar since this is on a split wire that doesn't even route to Sonar).

You can then record into Sonar at a 1024 buffer (if you want to be that ridiculous) and monitor your live singing with absolutely zero latency. It's perfect.

The Focusrite Scarlett 2i2 records clearly into Sonar without a trace of color.

So, yes, you can upgrade to an RME for a hefty price, or you can achieve bliss for about $160.

I know this works.

This is cool ! :)...I sure it does work. I just plugged in a cheap headphone preamp and managed to overcome the issue with direct monitoring. However, I cannot balance the levels of the voice and the rest of track, or add effects to the voice,  like your solution mentions. But your solution is really cost effective! useful information that helps ! 
 
Im moving to RME not just to resolve the latency issue but also for more I/O and the "better sound" that RME is talked about for and as a next step in the process of moving from beginner to intermediate level equipment !