I know nothing about Fallout mod so keep that in mind

I want some bugfix and/or graphics enhancing mods.

Looking at New Vegas Nexus I saw a few mods that looked good graphics wise.

One called Nevada Sky, adding weather and stuff (I think) which would be really cool as I want weather.
One called Electro-City, which added more lights and improved the lighting effects (I also think it added another area and some more npcs)

But I'm looking for more mods like high res textures and the like and mabye some bugfix mods(is there one that's stops things from getting stuck in the ground?)
Also are the two mods I listed any good?

Thanks in advance.

I'm by no means an expert on the subject, since I've only recently bought a PC version of this great game, but here it goes.

I'm using Nevada Sky URWLified All-in-one 3.1 with pretty good results. I had some issues with the .063 version, but the URWL version seems to work like a champ. I'm also a fan of one called Mojave Nights which adds a nicer night sky texture and a super detailed (and resizable) moon. No experience with the Electro-city, but it's supposed to work nicely with a lot of the weather mods.

As for textures, Poco Bueno is a good start. It adds some hi-res textures that are about the same as vanilla, but they aren't so large that they slow down performance. There's also Ojo Bueno that bumps the texture sizes up to 2048x2048 and an UHQ version that's 4096x4096! NMC's Texture pack is an alternative that comes in small, medium, and large sizes, but there's some radical changes to some of the art in the game (most for the better). I've been afraid to use them due to the recommended system specs (plus the large textures are 7GB!).

One side note on mods, since I'm fairly new to New Vegas on the PC and all the wonderful mods out there, is it's real easy to screw up your game by installing manually. Do yourself a favor and use FOMM to make installing/uninstalling easier for you.

If I instal a mod will it mess up any saves I had pre-instalation?

A mod will never damage existing saves, but in same rare cases a mod won't work with existing saves.

Some mods can affect permanent changes on a save created after the mod was installed (as in, after removing a given mod, some things in game remain altered); in general this isn't an issue, but it depends on the mod.

Queue

I use Electro City and it is great, it has Easter eggs planted seamlessly in the game, all the lights work lore friendly and it is attractive on the Strip. If you want a texture pack I would go with NMCs over Ojo/Poco's. I have used Ojo/Paco's in the past while waiting on NMCs and it is too laggy, textures seem too heavy on my PC, I can run NMC's on Large. My PC runs Skyrim and every Fallout on max settings with 4gb of ram to spare, ect. Overall NMC is a more profession texture artist, imho.

I have trouble with Nevada Skies so I don't use it.

http://www.newvegasnexus.com/downloads/file.php?id=43921 - Is one of my all time favorites.

http://www.newvegasnexus.com/downloads/file.php?id=35100 - Is an amazing mod that is a must have imo.

http://www.newvegasnexus.com/downloads/file.php?id=40691 - Speaks for itself in full HD glory.

I don't like using mods that fix the Fallout World. Fallout is Post-Apocalyptic, meaning everything and i mean everything should still look bad, just my opinion on this.

Sierra Madre on The Strip!

Hows this mod?

How do I install the mods themselves?

I'm using the FOMM, also would my computer be good enough for the large NMC pack in addition to a weather mod like Nevada Sky and Electro City?

8gb ram
AMD 6970
Intel i7 2600

I'm not a computer expert but to install the mods you copy the contents to the Fallout New Vegas folder
: Steam/SteamApps/Common/Fallout New Vegas

Read the "Read Me" included in each file and it will tell you how to install the mods. Always keep Archive Invalidation on and I suggest getting this: http://nvse.silverlock.org/

Edit: I'm pretty sure you can run all three mods you asked about, and more.