what is my system's weakest link?


Hi,
I have put together and entry level system, and have been enjoying it for a while now and feel it might be time to step it up and upgrade.

My system consists of:
Thiel cs 1.5 speakers
rega brio-r integrated amp
pro ject debut III Turntable

I use my system for playing records almost exclusively

What component should I switch out/upgrade first?

I have been looking into Mcintosh c28 preamps as an option to switch my integrated with, had a chance to listen to a system with that c28 preamp and it sounded great , warm and very detailed, and it seems to be quite affordable

Any way any advice or tips on what my next move should be regarding new equipment that is relatively affordable ($600-$1300 price range) would be appreciated

thanks
Morey
moreytalmor
After all the advice here, the only way to figure this out is to listen to some different pieces. As Frogman says above, take it slow and go one piece at a time.
Your speakers are approaching 20 years old so I would still suggest you start there. There was a pair of Quad 12L2s listed on Audiogon today for $500. I have owned both the Thiel 1.5s and the Quads and believe the Quads have a much more exciting sound.
Although it can be a grueling experience, the best way to know is to experiment.
With a limited budget the Thiel 1.5 must go due to demands they make with amps and offer little in return. As mentioned by others look into Focal, Triangle or even a current Rega speaker RS3/5 and keep the Brio. If you must have a Thiel speaker look into a 2.3 or 2.4 for a long term system/project. IMO the 2.3/4 are the "Thiel" sweet spot but you will need patience and money to get them right.
Thanks for all the feedback guys, I am definitely going to explore some upgraded cartridge options, still need to consider switching out the speakers, but will take it slowly.. hope I get to the right spot :)