Well i hope you get sorted, my boat is just shy of 12 years old now and i have owned her almost 6 years, they do take alot of money in the upkeep and mooring costs but for me i use it 2-3 times a week every week for 5 months if the weather lets me so its worth it.
A boat of that size you are looking at is mainly for inshore work or when the forecast says smooth or slight max with 2 people comfy 3 at a psuh. Do see them out further but IMO you need to be sure of the weather incase it changes.
Any boat owner who says they have never been caught out a bad sea is lieing, it can change so quickeven if you have alot of experiance.2 seasons ago we went out around 7 miles, not really far, flat sea weather stating light winds building during the night...after 4 hours fishing you could see in the far distance the sea was gray and we started heading in as i had seen that before...ow boy it was fun the last 3 miles, side on with waves about 3 seconds apart (meaning you never got a chance to climb the last one before the next broke over the boat)
Then you get the great days, not a boat in sight (i like to have nothing in sight) flat day, no wind sun in the sky and a few fish biting, with the stove on and a tin of curry or hot dogs on cooking away, birds diving and the odd dolphin in the distance.......perfect
Good luck with whatever you do and the lads on here as you have already found will help you out with any questions....Also try boats and outboards website, some good boats on i got mine from there.