You really do need to figure out what you want in a driving horse. Even "pleasure driving" has different meanings and different equipment - depending on showing vs just "splunking about"...
You said show but then you said local. Are you doing the mini type, ring classes OR looking to do ADS driving? Very different carts, harness and driving styles. Are you truly wanting to start w/ a basic cart or did you want to spend once and get something a little better? Even if you do "better" quality - you need to think about which direction you are going as what's accepted in one discipline isn't in another.
Kinda like "hunter" vs "dressage". They are both english riding and use the same equipment (at least at the lower/beginning lessons) - but are very different in movement (and conformation requirements), training for the horse and how the horse and rider communicate.
I chose to go with mostly working farm style harness - I can do SO MANY things with it. Yet, even though it is supposed to be accepted at some of the driving events I have attended, I attend those in "high end" Southern Pines and even the basic events this is frowned on!
Because I couldn't afford that harness at first, I started with a "mish mash" of harness and have only regretted one purchase (a Tough 1 nylon pleasure harness that didn't fit well and the fittings rusted out in 90 days and in less than 6 months the whole thing went to the dump - my braided from recycled hay string harness is better quality!!). Even w/ going w/ farm harness, I made choices that don't really allow me to show at the upper levels of AMHR/ASPC BUT I can upgrade the harness as needed to get to that point IF/WHEN i'm ready. Neither the cart (S) nor the wagon (s) I currently own are the correct ones for the showring in AMHR/ASPC BUT they work for US in what we enjoy and want to do.
I also have basic pleasure harness. Unlike some that have ez entry carts they truly like, I have an OLD, OLD sulky cart of unknown manufacture that can carry my 250+ weight behind any of our ponies - with just changes to the wheel size(s) and trace extenders for the smaller horses and I find it to be very comfortable for trail driving. It works for schooling a horse/pony for the show ring as it's the same type of cart used for all of those classes (in AMHR/ASPC - not for ADS, traditional or farm/draft driving).
I purchased an EZ entry style cart in TX in 2007, think it might have been a "true" Fronteir, but they've gone out of business. I traded it to a friend who had a smaller, no-name brand cart that simply didn't work for her larger ponies while I had smaller ones. I've had to do a lot of customizing on that smaller cart to make it work for me - would have been much less expensive (for me) to just purchase a new cart. The one thing I forgot about when I had it "customized", was those "cheap", little springs. I could have had something much heavier duty and more shock absorbing, ah well...
I just looked at where you are! You have VERY different options in your country for harness and vehicles than we have here in the US of A. Don't even know that you can get the same equipment where you are (such as the basic EZ entry cart)... I'm not even sure that the first 3 paragraphs apply to you -
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That your Gypsy boy in your avatar? He is a beauty and I'm sure you do miss him!