While I firmly "believe" that good power cords can be nice improvement. Do not use them for a turntable.
Phono cable: Nordost Heimdall 2. Not overly expensive just a good phono cord.
Phono pre amp: Roksan DXP SE or RCM Prelude. I own the RCM but regret that I didn't buy the Roksan. The Roksan costs a bit more but is better. Both are over your budget but if you do not buy a dustcover and fancy power cord they should be withing reach. Or even buy a cheaper phono cable. Like the Nordost Leif blue Heaven phono cable.
Phono cable: Nordost Heimdall 2. Not overly expensive just a good phono cord.
Phono pre amp: Roksan DXP SE or RCM Prelude. I own the RCM but regret that I didn't buy the Roksan. The Roksan costs a bit more but is better. Both are over your budget but if you do not buy a dustcover and fancy power cord they should be withing reach. Or even buy a cheaper phono cable. Like the Nordost Leif blue Heaven phono cable.