Hi Hi,
I was pretty much where you are at 3 months ago - I had the exact same requirements for my boat. I have ordered a Seaforce 530 (5.6m overall length) UTE as well as the smart gentleman above. I looked at second hand but worked out a great deal with the company to make my budget of sub 45k work for a new beast.
The things I looked at the most was safety, weight but usable room specifically for fishing. I did have width limitations (due std garage) needed to be be sub 2.4m on a trailer.
Seaforce being pontoon made it able to float full of water.....safety tick. Hull weight of a 530 ute is 500kg.....very light lighter than a 575/545 Surtees Ali boat.......people would say glass boats are heavy, some are Haines etc will be therefore you'll need a bigger car to tow it and bigger motor to push it.
I looked at Alis like Surtees and Mclay as they have the most room for fishing. I measured the "fishing deck space" of the surtees 5.75/5.45/4.95s etc. The deck space in the seaforce 530 ute is Larger than all three. Usable room on the UTE model is unbeatable in a sub 6m glass boat thats skinnier than 2.4m. If I was going Ali Id go Mclay, thats another thread thou......
A boat that should not be overlooked is a reflex, The 485 have more space than all above! But are over 2.4m wide on a trailer, they are made in china and seem to be thought to be low end boating. The Reflex 515 has less deck room than the 485, due fancy seating and cabin up front to be able to lie down in. the 565 or 585 has sim room as the 585 in the back but is a much bigger boat overall. The 485s start new for about 45k
I initially thought I wanted a 6.0m boat, but the reality was I needed to be able to launch solo and didnt want a landcruiser to tow it and a hangar to store it. My Wifey is a novice boater so the smaller boat is going to be easier for my family to use....aka me to run them to enjoy.
For you I would look at the 530 mate
https://www.seaforce.co.nz/530-mate or Ute version. Every review states they are amazing, they also won best sub 6m boat when they were released.
Im putting a suzuki 100hp (2.0 litre block same as 115/140hp) on mine, Rick from seaforce says they will do 62kph with a honda 80hp on em with 2 adults....... The gent selling one on TM with a 115 merc says his will do 40knts.....so they will perform. I nearly purchased it....but went new as I said before.
Make sure shes a 4 stroke that you put on it, seems no one wants smokers anymore, regardless on how many hours they have done or how good a 2 stroke (smoker) is.