budget phono preamp selection

After reading countless threads here and elsewhere, I seem to have narrowed down my "budget"($250) phono pre's to the Cambridge 640 or the Musical Fidelity V-LPS. I currently have the Nad PP3 but am not satisfied with the overall sound(not too dynamic, kinda "1 dimensional"). I want to convert my LPs to CDs over the winter, so thought the Nad w/usb would fit the bill but can't say I'm all that impressed with it.I've got an M-Audio sound card I can use instead of the USB. First, will either of these two make a substantial difference in sound for me over the Nad? (Music first). I have a Music Hall MMF5.1 TT,(Goldring1012GX MM) Sunfire TGII(w/phono stage)reciever,Sunfire Cinema Grand Sig.Amp, Definitive Tech speakers. Am I looking at this clearly? Ideally I would like a phono pre that would have a very good sound on my system and then be able to use to convert my LPs to digital later without having to spend too much.Thanks in advance for any input