I've had a FPB 300 and FBP 600 and in your budget, recommends an used VAC SigMKIIa (later upgrade it to SE ... upgrade is SIGNIFICANT). I didn't realized what POS all my Sonic Frontier preamps were until I demoed a VAC.
A new VAC Renaissance V SE Preamp is around your budget but I don't have personal experience so can't recommend. If you have a VAC dealer, worth checking out.
I'm familiar with McIntosh C2200 and recommends rolling the 12ax7a with Telefunken ribbed plates. McIntosh is not my cup of tea but replacing the cheapo Chinese tubes was a very nice improvement.
A new VAC Renaissance V SE Preamp is around your budget but I don't have personal experience so can't recommend. If you have a VAC dealer, worth checking out.
I'm familiar with McIntosh C2200 and recommends rolling the 12ax7a with Telefunken ribbed plates. McIntosh is not my cup of tea but replacing the cheapo Chinese tubes was a very nice improvement.