I purchased a HP H8-1070t bundled with a 23" LED monitor last year. I haven't upgraded it at all except for putting in a TV Tuner Card.
Intel Core i7-2600, 3.4 GHz, Quad Core
8gb RAM (2 free slots)
AMD HD 6450, 1gb (PCI Express x16)
1.5 Terabyte HD, Seagate Barracuda 7200rpm
Windows 7 Home Premium 64 bit
It's not like it's really bad and lags all the time, I just want to make it better.
I do HD video editing sometimes, some gaming but I want to be able to run games very well. I only have Minecraft at the moment but I will probably be getting some more graphic intense games in the future.
I will probably upgrade to 16gb of RAM soon. I am also thinking about adding a SSD or swapping out the graphics card.
Can you recommend either a SSD or graphics card that is good?
If you have the 300w power supply then the strongest card you can add is an 80w HD7770. If you have the 460w power supply then you can add about 200w of graphics which is a ton. The 600w will cover any card you can buy today. You PSU is a standard size and can be swapped for an ATX PSU. If you swap PSUs make sure you get a quality one -- bad power causes all sorts of problems and there are no standards for how much ripple and voltage drop the PSU has under load.
Google any card you pick with TDP to find its max power usage. For example, google hd7770 and TDP to find the hd7770 uses 80w max.
To verify which power supply (PSU) you have open the case and read the label on the side of the power supply. If you get a card that uses more power than your PSU can supply the system will run to desktop, then will crash/bluescreen during heavy gaming or in hot weather when PSU output drops off.