Seeking advice on upgrading my PC

[boofhead]

It's pretty good, but I want it even better for super-hardcore graphical and speed awesomeness.

Here is my current system: (sorry for messy presentation I copy/pasted it from the old e-invoice)

Spoiler Alert, click show to read: 

Samsung SH-S223C Internal 22x Speed SATA Dual Layer DVD-Rewritable, DVD±RW Drive 12x, DVD-RAM 16x, +R DL 12x-R DL, Black (SH-S223C/BEBF)

Avexir Standard Desktop Memory 4GB kit (2GB x 2) DDR3 - PC3-10600 (1333MHz) - Dual Channel - 240-Pin DIMM 9-9-9-24 (AVD3U13330902G-2SW)

Seagate Barracuda 7200.12 ST31000528AS 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive

Thermaltake Dokker Midi Tower Chassis with HDD Dock - SECC - 10x 5.25" & 3.5" Drive Bays - USB 2.0, HD Audio (VM600M1W2Z)

Corsair Cooling Hydro Series H50 High-Performance CPU Cooler - Pre-filled - Closed-loop System - LGA775/LGA1366/LGA1156/AM2/AM3

AMD Phenom II X6 1090T Black Edition, 3.20GHz, Six Core, Socket AM3, 125W TDP, 6x512KB L2 Cache, 6MB L3 Cache, Boxed (HDT90ZFBGRBOX)

OCZ Vertex 2 2.5" 60GB SSD - SATA II - MLC (OCZSSD2-2VTXE60G)

Gigabyte GA-890XA-UD3, Socket AM3, Dual DDR3-1866, AMD 790X+SB850, HT 3.0, 8x SATA (6x SATA3), 2x eSATA, 1x IDE, 1x FDD, CrossFireX, 2x PCIe x16 (x16+x8), 3x PCIe x1, 2x PCI, 18x USB (2x USB3), 3x FireWire, Gigabit LAN, 7.1ch ALC892, ATX

Antec TruePower TP-750 Blue 750W ATX Power Supply - 120mm Fan - Dual PCI-E Graphics Card Connector - NVIDIA™ SLI™ Ready Certified - 80PLUS® Bronze Certified - Cable Management (TP-750-BLUE)

Microsoft Windows 7 Home Premium, 64-Bit, DVD, Single Pack, OEM (GFC-00599)

Gigabyte Radeon HD 6950 Video Card - GDDR5 2048MB 256bit VRAM - 800 / 12500MHz (5.0Gbps) Clocks - PCIe 2.1 - 2 x DVI, 1 x HDMI, 2 x Mini Display Port - CrossFireX Ready - DirectX 11 & OpenGL 4.1 (GV-R695D5-2GD-B)

What should I upgrade as I am NOOBISH when it comes to hardware....?

Surely the RAM? Or should I just get it Crossfired? What I would like to see is a very noticeable difference in frame rates from demanding applications like FSX with REX2.0 and OrbX Terrains on best graphical settings, for example.

I'd be willing to spend a decent amount if it was really worth it.

[EDIT: Thanks again to Mr.Crusty for recommending me this current system 14 months ago! It has served me wonderfully!]

[Zerosliver]

Your system is still pretty nice mate, however you might want to look into a better processor, which also means you'll need a new motherboard. This would probably mean getting a z77 chipset motherboard with an intel ivy bridge processor, or perhaps an older sandy bridge i5-2500k.

Also, upgrading the ram would accomplish nothing, 4gb is enough, however you could upgrade to 8gb if you wish, it's quite cheap.

[Blau&Gruen]

Upgrading RAM would be good idea as memory sticks are not so expensive these days, e.g. 2x4GB or 2x8GB if your board can handle them.

GPU would be another possibility. Crossfire is not worth cause you're going to build a new rig sooner or later.

[boofhead]

Also, upgrading the ram would accomplish nothing, 4gb is enough, however you could upgrade to 8gb if you wish, it's quite cheap.

Upgrading RAM would be good idea as memory sticks are not so expensive these days, e.g. 2x4GB or 2x8GB if your board can handle them.

This leaves me a tad confused - would upgrading the RAM help or not? I'm sure my PC could take a 2x8....

[Blau&Gruen]

Windows likes to swap processes into the RAM to relieve other storage sections.

[Zerosliver]

Having lots of ram really isn't worth it unless you do heavy photoshopping or edit videos. For gaming 4gb is fine, but upgrading to more for the future isn't that expensive.

As for performance, upgrading your cpu (and thus also your motherboard) is the best option to go for.