When you get you S4 with JB you willl be in a whole new world. Great music app that works very well is Doubletwist. Thats my favorite music player. I know it will run Wav files, but I converted to MP3 @ 320 cbr. Sounds very good and I can store more on my 32gb card. 

Nokia didn't go down, the Windows Phones are awesome! Congrats on the S4. I hear good things.

Thank you for the suggestion, I will definitely check it out.

One must also think of security and anti-virus, even on a SmartPhone. If you happen to misplace it an app called LookOut Security has AV and will locate your phone for you should you lose it.

There are music apps for android that will play flac files.

EDIT:

According to the specs, your phone should support FLAC files natively: http://www.gsmarena.com/samsung_i9500_galaxy_s4-5125.php

1)The Weather Channel's weather app is nice. It is free, but does have ads (they are unobtrusive in my opinion).

3)I have a few music players for my S3-

https://play.google.com/store/apps/details?id=com.neutroncode.mp&feature=search_result#?t=W251bGwsMSwxLDEsImNvbS5uZXV0cm9uY29kZS5tcCJd

https://play.google.com/store/apps/details?id=com.n7mobile.nplayer&feature=search_result#?t=W251bGwsMSwxLDEsImNvbS5uN21vYmlsZS5ucGxheWVyIl0.

https://play.google.com/store/apps/details?id=com.maxmpz.audioplayer&feature=search_result#?t=W251bGwsMSwxLDEsImNvbS5tYXhtcHouYXVkaW9wbGF5ZXIiXQ..

4) I am not familiar with Sipdroid, but I quickly searched and found that Google Voice can be used with Sipdroid. I hope this helps.

PS-Amazon gives away a free app every day, if you were not aware of it.

I've been told that many cell phone professionals that AV apps for smartphones are a waste of resources. Slows the phone down.

Oh and my Windows phone has that "locate the phone" built in, no need to download an app. 

Doesn't slow it down at all, been using it for a couple of years now. I mainly like the locate feature in case it is ever needed, it is free too and gld they built it into the Windows phone. I just got a Samsung Galaxy S4, but I actually wish I would have stayed with my Motorola Atrix II. The S4 is OK, but there are a few things I don't like.

I've sen an android based phone get slowed down because of AVG. It happens. 

I use GrooVe IP myself and it works well enough, though I don't use it super often (and mostly from my tablet when I do).

It's $5 though if I remember right, if you're only looking for free apps. But the upside is that you don't need to set up and rely on some additional PBX provider like you do with Sipdroid in order to route via Google Voice.

I have had an Android smartphone and an Android tablet for a few years now, have had no need for an A/V.

 I also second the suggestion for looking into security software on your droid.  Both windows phone and ios are more 'locked down' than droid and while not necessarily more inherently secure the apps for same also tend to undergo more scrutiny.  In the end I would say it comes down to how one uses the OS platform.  If you are the type of person who buys a phone, adds one or two well known apps and uses the phone mostly 'stock' and are prudent when it comes to basic security practices........well then I'd agree with RND that security software might not be needed.  If however, you are the type of person who routinely installs/tests newer apps etc. then I would suggest the need for security software on any device.

Some app suggestions....

For weather apps I've found both Accuweather  and WeatherBug quite satisfying in terms of accurate (as accurate as any weather prediction can be I suppose) and up-to-date information.   For a somewhat less-useful but prettier weather app (something I use on my iPad for instance when it is sitting on the corner of the desk etc.)  I  use an app called Weather HD. 

I would give you more app suggestions but not only are some of my favourite and most useful apps for windows phone they are also Nokia exclusive apps 

Yeah the Nokia apps are really good. I use several of them on my phone. 

In that category, check out Rainy Days. It overlays the NOAA radars over Google Maps (just radar, no forecasting, but that's generally more useful for near-term anyway).

Thank you for the suggestions, I am checking things one by one.