Best Bass amp


I was wondering in a 2-way setup(Classe CA-400on mid/hi) which would be best on my dual Volt 12's/side(30-380hz),Krell KSA 250,300s,fpb300(would love a 600)?I do not want to spend any more than $2-$3000.There is a fresh rebuilt KSA 250 a couple hours away but did not want to under power or if a 300s would be better?The 12's are 300watts each but have put a Bryston 14bsst on them with good results in the past,just wanted to try the famous krell bass.
Any advice
thanks John
mclsound
Don't know about "best" in terms of sonics but one of the best values would be a used Eagle or EKSC. The Electron Kinetics Service Center builds upgraded models and services the older John Iverson Eagle amps so they are not orphans.

Great power and control from a package that runs cool for its rated output. No longer so well known as Krell, Classe, Bryston, etc. so can be a great value.
I never said the KSA 250 wasn't a good bass amp. What I said is that there are other Krells that are better bass amps.
If the KSA-250 isn't a good bass amp, which ones are?
Perhaps a FPB 300 would be better? Why? I would like to know as I am also looking for a strong bass amp:)
Thanks guys
I was looking for a second 400 in silver but they are in tough shape for the money being asked.
I am not into 20lb for $2000 class "D" stuff,at least not yet.
I have a chance to acquire a KSA 250 in good shape and was recapped in 2008.I have had a Bryston 14bsst but wanted to try the Krell bass and I am not sure if the 250 will be close to the low SPL of the 14.
If you don't mind the heat the KSA-250 will put out it will more than control your speaker. I used them on old B&W 801 Matrix 3's (89db efficient) and the KAS rocked! This amp can easily drive a 2 ohm load; you will have no problem. I used a Jeff Rowland Consummate preamp and I think of all the equipment I have been through; Krell FPB 300; 600, KPS-25sc with FPB 650 monos, then FPB 750 mono's with a KCT and the KSA still holds its own. If you have a good musical preamp and good cabling you will be please. My favorite all time Krell system was my 750 monos and the KCT. Wish I still owned them to drive my Wilson MAXX 2's; best bass ever.
I would look at a classe D amp. Something like Bel Canto REF500S Dual Mono Amplifier. Some people complain that Class D ICE chips provide "funny" sounding bass, but Bel Canto has solved this riddle with the reference series. You can get a REF500s online now for under $2000 new.