Best budget preamp for my entry level system?


Greetings everyone. I need some input on the selection of a pre-amplifier.

After years of making the most of and enjoying my existing budget system, I'm kicking in a few dollars to upgrade my system. I'm currently using a Marantz 2215B receiver, a Pioneer PL-550 turntable, a pair of Boston Acoustic CR-9's, an old junky JBL sub, and a bluetooth adapter to connect to my i-phone for streaming audio....

So far I have purchased the following replacement / upgrade components: Zu Audio Omen Dirty Weekend Speakers, and a Emotiva UPA-200 Amplifier.

>>> Any recommendations on a pre-amplifier? I'm definitely thinking pre-owned, and something around $300. Would want to connect my existing turntable, and a good quality CD player to it in the future. Also like to use my I-phone as a source as well through either a bluetooth adapter, or plugging in directly. I mostly listen to classic rock and rock.

Thank you, any feedback provided would be greatly appreciated!

Rene

barkeyzee1
Post removed 
I read the review on the USP-1, sounds like a lot of bang for the buck. The most up to date Emotiva equivalent is the PT-100 for $329, and includes a DAC, phono input, etc.

https://emotiva.com/collections/pre-amps/products/pt-100
If you hadn't already purchased the amp, I would have suggested an integrated. Since you have the amp, and wish not to sell it, the PT-100 offers allot for the money; phonostage, DAC, headphone amp, and 3 additional line level inputs. 
For well under $300 you can get a B&K Reference 20 or even a Reference 30 preamp and, although not 2 channel, they perform exceptionally well in 2 channel. These originally sold for around $2500 and have a lot to offer. I own one of each along with a lot of other stuff and I am amazed at how they clear and detailed they are. 

To play vinyl you will need a phono pre. A Schiit Mani for $129 would serve perfectly.