Macbook Pro with only one Thunderbolt port and Hard Drive and Monitor need

Hi, this is Israel from Puebla, Pue. México.
I have a Macbook Pro mid 2012 @2.5 GHz Intel Core i5 256 SSD WITH ONE THUNDERBOLT PORT
and one Thunderbolt Lacie Rugged Hard Drive connected, I'd like to attach an external monitor for better color correction and I can't plug it because of the ports.
I'm in business for about 4 years, this Macbook is good for my job, (average 3-4 days editing for week, few animation in motion, etc.) I'm not interested in upgrade this hardware, but I need a bigger screen, what would you suggest for me?
Buy a new Macbook Pro in maybe 1-2 years? (and wait for the screen)
Buy an Thunderbolt Hub?
Maybe get an USB3 adapter?
Really I don't know what to do, of course money is always enough reason to take a decision, but this is my company and the only income I get.
I really appreciate an advice, thank you!

For your situation, best to get a Thunderbolt hub. Then you still use the Thunderbolt Rugged + get a monitor.
I'm not sure what your thinking is about your last question to get a USB 3 hub. USB 3 isn't as fast as Tbolt for one thing.

When you get a hub and add a monitor, that will cut back on the graphics processing power a bit because now your driving two screens. When you export Projects, you will want to disconnect the external monitor during export.

Apple Thunderbolt Display has T'bolt ports in it, so you can daisy chain other T'bolt devices off of it.

Thank you Bobbyco, I thing, for the moment, that that is the better option I have before the others.
The USB adapter (USB->DVI or HDMI) it's about $60 dollars or maybe less, cheaper than the hub but I've read comments on the web saying is not as good as you (we) thing.
And really thinks for the advice on disconnect the external monitor on exporting media, thank you for all.

I know that! but my wallet now it's starving, I love the T'bolt design, over the iMacs (which I don't like it's design at all) But for me isn't an option because it's expensive price, thank you!

MrGatoPardo wrote: Thank you Bobbyco, I thing, for the moment, that that is the better option I have before the others.
The USB adapter (USB->DVI or HDMI) it's about $60 dollars or maybe less, cheaper than the hub but I've read comments on the web saying is not as good as you (we) thing.
And really thinks for the advice on disconnect the external monitor on exporting media, thank you for all.

Israel, You're welcome.
You would be better off waiting another payday or two to get a Thunderbolt hub over the USB 3 to video options. You will be rewarded with improved throughput performance, better overall reliability and expansion options beyond adding a larger display. That's a lot of benefit for an additional $60 or so.

Later on, if you feel the need to try and improve performance, add RAM. It's inexpensive and will greatly improve your system's responsiveness. (I believe you only have 4GB now if I looked up your model correctly.) It's an inexpensive investment that can breathe some life in your Mac If you know realistically you are a couple years away from buying a new one.

You're right!
Thank you Bobbyco I'll do those suggestions you've give me as an step by step gide! thanks for the time you've spend on write to me.