I know exactly where you are at. I bought the same stuff you did, almost exactly. email me at email@example.com and I can go more into detail.
But generally speaking, i would sell the cartridge and get a benz. the arum is good but the benz smokes it. email me and i'll go into detail. i had the arum, your exact system.
i also think cables will make a huge difference. audio magic for vinyl is the best, hands down, in my opinion, and i've tried many. Your PLC will make a tremendous difference. Audio Magic for the money has the best there is. I'll tell you what happened to them in the latest magazine review that just got pulled. plus I own all this equipment myself, bought with my hard earned money so i know. I wasted my money on lots of stuff, literally thousands.
The best speaker, once again hands down, green mountain, continuum 2.0 but he has less expensive items. these will blow anything away. i'm talking musicality, the only thing that matters. i'm in the middle of selling most of my cds because vinyl is so much better. in fact i'm headed down to the record store right now. trust me, i think i know what i'm talking about. don't waste your money by reading advertisements. don't. you'll get burned. sure the stuff is good, but there's better. guaranteed. some of the best equipment you read about in stereophile. because of politics and money. long story. there's also better cartridges then the benz. i'll tell you about them.
speakers green mountain 1-719-636-2500
cables and plc audio magic I can help you there, possible get you a great deal too 1-303-556-4064 (i'm not selling these to make money, it's because they're the best and i love them and own them and have for years, way before starting selling them (demos ). plc is a killer, guaranteed!
cartridges ortophon, new one, benz,
tt--email me, i'll help you there as well. your arm is good.
amp --edge --is dynamite
preamp -- not my strongest area, but i own the sim audio
phono stage--this is an absolute must--you have to get one....the best for the money and absolute little phenom, E.A.R. (but you need new tubes and cabling, once again, audio magic)
there's probably other areas and we can walk thru those. if you don't want to lose your money, listen to one that has already walked down the road you're headed on.
speakers, get the best and everything else will be a breeze to judge from, your choices,,,that's the truth. it starts with the speakers. best are Green Mountain 1-719-636-2500, talk to the owner, Roy Johnson, he's the best and he'll walk you thru all this whether you buy from him or not. trust me, this will be the best and cheapest call you'll make. he walked thru all of it with me as well. he loves doing this, it's his job. you don't have to buy from him either. he only sells speakers and he's not high pressure at all. he hates to see people get stuck. please tell him Bob Mager talked with you. he'll steer you right and give you great advice on what ot look at and most importantly what to stay away from. he's saved me thousands, millions!
good luck and will love to talk later with you....off to buy records.
303-556-4064 or email firstname.lastname@example.org