Though this would push you a bit over budget for now, but something to consider down the road, is an SSD to install your OS on.
There are really good 120GB models on the Newegg site for as low as $80 on promo, you have to sign up for codes & you can use these on your other upgrades too. 120GB is plenty, if you keep your downloads, movies & whatever on your data drive. And will likely be the fastest component on your system.
The Samsung 120GB 840 EVO is one of those that I have & one that goes for as low as $80, though $85 is more typical. The 250GB model, of which I also have, runs for as little as $130. Used to be, RAM was considered the best bang for the buck, now it's SSD's, since RAM pricing has skyrocketed since late 2011 lows, when one could get 8GB for $30 on promo (how I upgraded my MSI). The same exact set was $74 last year, when I upgraded the Toshiba & that was with a $10 off promo code. BTW, here's my 120GB Samsung 840 EVO. Linux Mint 17 is on it by itself now, though will soon have to make room for the Windows 9 Preview. Windows 7 & 8 are dual booting on the 250GB one.
This is the graphics card that I purchased to upgrade the weak one that shipped with my Dell earlier in the year. However, I didn't install any of the junk software included that was out of date anyway, downloaded the drivers straight from AMD. It's overclocked out of the box anyway, it's not going to withstand that more of a push. Not a bad card for $100 & 3 year warranty. One 6 pin power cord needed from your PSU, there are included adapters for if you don't have a native 6 pin graphics card power plug. Runs good with my 460W PSU & has never ran hot nor noisy, though I don't game. However I do run virtual machines, that takes graphic power too.
Still, as my colleague synergy513 points out, more RAM is needed. Back in 2009, 4GB was considered the "sweet spot". Today, it's 8GB, as technology has evolved & more demands are placed on components. Adequate RAM is a must have.
And BTW, Welcome to BC Forums!
Just noticed it was your first post, almost forgot my manners.
If you need further assistance with choices, let us know.
Good Luck with your upgrading, it will make a difference.
Edited by cat1092, 26 August 2014 - 11:33 PM.