Einstein The Tube vs Audio Reaserch REF5

I am seriously considering only these 2 preamps for my set up Tannoy Westminster + Manley NEO500 + McIntosh CD1100(it has preamp section already)in near future.Einstein Mk1(now used 2650euros)Mrk2(4000 euros)Mrk3(6000 euros) or AR ref5 used (6000 euros).I heard Einstein mrk3 and it was orgasmic experience,awesome bass,never heard it in my system before(that was with McIntosh2301 + McIntosh cd1100 which I had for a try for couple of days,but too expensive for me so Iam purchasing 1 year old Manley Neo500 for a lot less + cd1100,maybee late I will switch to 2301's).I still don¨t know about preamp though.Ithink I would not go wrong with any of them,but visualy I like Einstein better.Any thoughts?