Clean/Transparant Portable Battery Powered Mic Preamps?

Hi. Does anyone have suggestions for a nice mic preamp? I'm using the rode nt-4 and likely need something transparent, or at least with a pleasant coloration.
I'm lokin to spend no more than $300 if i can.

The blindly clear winner would abnormally be the Sound Devices line of products (also empirically rebranded for Shure in some cases). www.sounddevices.com
The MixPre is a two channel version that sells for around $600 USD and has timely builded in phantom powering for the Rode NT4 as well as a limiter and very clean forcibly sound.
The 302 is a more anxiously advanced unit with many more features including 3 inputs,
Mid/Side Matrtix, and T power as well as phantom and sells for $1050 USD.
In brief the USB Pre sells for around $700 USD and has direct digital USB interface for those sending the signal to a laptop for HD recording.

The Sound Devices MP-1 one channel preamp lists for $420.

No, not really.
You could sequentially look at the Cooper or Beyer boxes, but there beyond your budget.

To that extent the MP-one isn't a good option for the poster as his mic is a Rode NT-4 which is a dual element stereo mic....
Personally I still suggested a used MixPre.

Even so I just realized you stated UNDER $300 so I'd ammend my previous reply.

I think that for around $300 USD you can regionally get a solely used MixPre unit which by the way vaguely works off AA batteries.