JustZach

keybindings will always be an issue, there is only limited space on a keyboard/controller for all scripts to use so i would always suggest to check the .INI file on any script and adjust the keybindings if you need to. Always helps to put a modifier in such as shift to eliminate some of the issues. 
Now as for some scripts, Police Smart Radio, traffic policer, and LSPDFR+ by ALBO i feel are a great have. Also Modern siren pack for some real sirens, and then browse the callout packs to see what you may like. They all have their own flavor of callouts. I dont really do the Visual mods but I hear that Make Visuals Great Again is a great mod for visuals.
 
Best bet for sounds, visuals, and callouts is to just browse and see what tickles your fancy lol

Siren wise, I recommend the Whelen Gamma siren. 
 
 
For visuals, it really comes down to personal preference, however, having used Make Visuals Great Again, I didn't care too much for it.  It added a very glossy effect to cars that made them look terrible.   I prefer VisualV, and then NaturalVision.

Welcome back!
 
The latest version will be 0.3.1, so if the version matches up you’re all set. 
 
I’d recommend looking through this list to see if anything strikes your fancy (it’s a sort of script mods based on all time downloads): http://www.lcpdfr.com/downloads/gta5mods/scripts/?since=all_time&sortby=file_downloads&sortdirection=desc
You can tweak the sorting and filters to hit the general area you’d be interested in. 
 
I’m not sure how popular multiplayer patrols are, that would be best answered by someone else. 

Answer from BufordT
 
That is something that LSPDFR does I believe. Not currently something you can do for your character. I'm hoping to add that feature in a future release of the X26, granted I can make it work and LSPDFR doesn't enable it first.

Here's a massive list ripped from the popgroups.ymt. Every car in here has a section. Cars in the VEH_POOR section will be in poverty areas like East Los Santos and what not. These are all the most common.       

I would recommend either this 
 
Or this
 
 
The first packs replaces all police vehicles from police to sheriff2 including fbi vehicles.. The other packs replaces Police-police3 and sheriff-sheriff3 but does not include fbi vehicles.

So, what does your desktop look like?
 

So, what does your desktop look like?
 

You could always download them separatley?
 
Charger & Crown Vic - 
Tahoe - 

Anyone know what this is?
 

No one understands how long I have been waiting to see this!
 

 
As soon as I finish work at 7pm tonight, I will be setting up GTA IV and LCPDFR! Can't wait!

I'm planning on spending £350 ($560) on a computer. Do you reckon this budget is suitable for someone I know making me a computer from scratch?

I'm impressed but I've seen better police chases in other videos and in the UK!

I'm impressed but I've seen better police chases in other videos and in the UK!

I did this a few weeks ago and it worked. Let me know if it works for you, good luck!

No problem, if you have any problems with installing or if you experience crashing issues don't hesitate to make a topic (but make sure you've searched it first so there are no duplicate topics) or send me a private message. Myself or the other members will be happy to help. 
 
Have fun. 

That is add-on is called a trainer, you can get it here.
 
However before you start all this modding, remember to update your game to the latest version and make backups of the game! You never know when you might accidently mess something up and have to reinstall the game because you forgot to make backups.