Was looking for some help/suggestions which components are more important to upgrade for a stereo system upgrade?

(ex..Is it more important to have a better upgrade in speakers than better receiver and or better turntable than a receiver?Should I just upgrade my phono cartridge)



I listen to allot of vinyl and cd's.In vinyl listening I am looking for that nice clear/loud sound w/out spending $10k...want something that really enhances the vinyl sound that its meant to sound like.

I have a $1k/$1,500 budget no more then $500 on EACH components and speakers.



I currently have:

-Sony PS-LX300 USB turntable

-Technics SA-EX140 60hz/155w Receiver

-Bose 201 iv series



After researching stuff I was looking at these to get. What do you think and or do recommend something else?

-Pro-Ject III debut turntable

-Or keep my Sony turntable and just upgrade my cartridge to a Sumiko Pearl cartridge

-Yamaha A-S500......looking for a built in Amp for more sound in my receiver

-EPOS - ELS-8 BOOKSHELF SPEAKERS



Also what CD player is good to get under $500 that enhances the sound?