Opinions on preamps


I am considering upgrading my pre amp. My system is as follows:
Sonic Frontiers SFL2
VAC Renaissance 70 MKlll
Klyne 7 PX3.5 phono
Verity Parsifal Encores
Basis Debut
Graham 2.0
Clearaudio Accurate
Dedicated room with much attention to details (wires, set up, isolation)

The weak link in my system is the SFL2 preamp. I am considering the following:
BAT 30SE
BAT 50SE
Wyetech Opal
Hovland
Emotive Sira

Anyone familiar with these items.
Your thoughts would be greatly appreciated

Thank You
bkonig
Gregm - I am not a big fan of the klyne line stage. I compared the cat W/Phono to the klyne with SFL2 and found the Klyne SFL2 far superior.

Czbbcl - I have owned and tried various CJ amps and preamps. They are not my cup of tea (very nice but too thick, opaque, not a clear enough window). However, I haven't heard their newest lines.

Kana813 - I have tried various amps. The VAC is a 65 watt powerhouse and is one of the most stunning pieces I have ever owned. When I compared the SFL2 to a first class passive, I heard how electronic and grungy the SFL2 really was. However, the passive did not have enough gain or dynamics. I am very happy with my Klyne.

Celery - Although the system sounds super, I am looking for greater purity, transparency and realism. I know that my VAC is on a different level than the SFL2.

Thanks everyone for your input
I've heard the Hovland - nice, but too noisy. The Sira is very nice, but getting a bit pricey (IMO). I haven't heard the Opal, but would keep it on the short list based upon build quality and positive reviews.
Have you considered a Fi, or Audio Note linestage?? They are both very musical. I own the Fi full-function pre and compared it to both the Sira and Hovland before purchasing. A friend owns the AN M-2 pre and I have borrowed it on occasion - very nice and the one I would own if I hadn't already invested in the Fi.

Good Luck!
Bkonig- I have a custom built passive preamp and I also own
a SFL-2. If you're hearing "grung", then your SFL-2 needs new tubes, adjustment or it's defective.

I'm sure your VAC is a 65 watt powerhouse(for $14K it should rock your world), but like it or not it can't generate much current into a 4 ohm load. If your speakers are rated at 4 ohms, you can bet they dip below that level.

But hey, if it's floats your boat, you should unload the SFL-2/Klyne and buy the VAC Signature Preamp w/phono and complete the deal. Mixing active components from different manufacturers is always tricky.

Stick with what works best for you.

Good luck with your quest.

Aloha.
I don't think the naysayers about the VACs power rating have heard this amp. It actually has 3 speaker taps: 1-2 ohms, 4-8 ohms, and 8-16 ohms. The power rating is stable at any of these taps. I have heard it on my Aerius i (89dB, 4 ohm nominal), and it is VERY powerful. I can't ever get the volume dial on my preamp past 11 o'clock.
The VAC, according the Kevin Hayes, is sensitive, and needs a preamp that has LOW gain, ideally around 10dB.