Hi Letch
You're not going to get a new Softone Model 4 (M4) for $425. Assuming you are in the US, the cost is $800 US including shipping. Unsure what the wait is but 1 -2 months isn't unusual.
I've owned Hana carts and they are very good value.
In my system the M4 far outperformed the GoldNote PH 10 with PS-10 at around $3K.
I think most that own or have owned an M4 would agree that you have to spend a LOT more to best it, assuming the limited settings work for your cart.
The M4 isn't pretty IMO, but it is built really well (it's heavy) and seems to have a robust power supply. The mute button is a really nice feature .
I've been enjoying the M4 for about a year now, but it's not a perfect match for the ultra low impedance MSL Signature Platinum, so I'll be switching to the Sutherland Little LOCO (can't swing the DOS Loco right now), so the M4 will be available very soon.
There is an M4 for sale now on USAM for $800. I'm guessing it is owned by AG member YYZ Santa Barbara. Mine will be less.
The M4 gain specs for the 3 settings are not on the website so here they are:
MM: Gain 45dB, load resistance 47k ohms
MC High: Gain 67dB, load resistance 100 ohms
MC Low: 72dB, load resistance 25 ohms
I use MC Low, MSL output is 0.5mv, 67dB is plenty of gain.
The KAB calculator shows 45B of gain should be a good match for your 2.0mv cart.
Lastly, while the Mullard's are great (and very expensive), I'm currently running NOS RCA 5751's which sound really good. I tried NOS Tele's and decided they are too grainy.
I hope this helps, and good luck.