Need a low budget fix for a HDMI port on my 2006 OPTIPLEX GX 620 not sure what would be a good fit?

I have a 2006 Dell OPTIPLEX GX620 (Mini Tower) CPU Name Intel(R) Pentium(R) 4 CPU 3.00GHz Threading 1 CPU - 1 Core - 2 Thread Frequency 2992.32 MHz (15 * 199.49 MHz) Multiplier Current: 15 / Min: 14 / Max: 15 Architecture Prescott / N0-Step (90 nm) Cpuid / Ext.F.4.3 / F.4 IA Extensions MMX, SSE, SSE2, SSE3, EM64T Caches L1D : 16 KB / L2 : 2048 KB Caches Assoc.L1D : 8-way / L2 : 8-way Microcode Rev. 0x000005 Vcore 1.42 Volts Type Retail (Original Frequency : 3000 MHz)

Motherboard Model Dell 0HH807 Socket Socket 775 LGA North Bridge
Intel i945P/PL/G/GZ rev A2 South Bridge Intel 82801GB (ICH7/R) rev A1 BIOS Dell Inc. A11 (11/30/2006)

Memory (RAM) Total Size 1536 MB Type Dual Channel (128 bit) DDR2-SDRAM Frequency
266 MHz - Ratio 3:4 Timings 4-4-4-11-15 (tCAS-tRC-tRP-tRAS-tCS) Slot #1 Module Samsung 512 MB (DDR2-537) Slot #2 Module MOSEL 256 MB (DDR2-537) Slot #3 Module Samsung 512 MB (DDR2-537) Slot #4 Module MOSEL 256 MB (DDR2-537)
Graphic Card GPU #1 Type Intel 82852/82855 M/GME
GPU #1 Brand 0x1028 (0x01AD) VRAM #1 Type 224 MB GPU #2 Type Intel(R) 82945G Express Chipset Family GPU #2 Brand 0x1028 (0x01AD) VRAM #2 Type 224 MB DirectX 9.0c,

Storage (HDD/SSD) Model #1 HDS728080PLA380 Capacity #1 80 GB. Microsoft Windows XP Home Edition Windows Subver. Service Pack 3 (Build 2600.

I recently installed a D-Link Gigabit Desktop PCI Adapter card Model No: DGE-530T into one of the single slots at the back of the tower using the top white slot which allows me to use the Ethernet port for my ARRIS WiFi router. That increased my Mbps download speed from 28-34 to 48-55.

I would like to connect my desktop computer to my Sharp Flat screen HDMI port. I want to use for a HTPC utilizing the XBMC format. I have a Digixstream 2.4GHz/ 5.8GHz Dual Band WiFi DLA for the Flat screen. (1) suggestion was to purchase a $ 50.00 Genuine Rii i28 Mini ONE Keyboard. World's First Mini Keyboard, Airmouse, Touchpad, Audio chat All in ONE Multi-media Remote Control and Touchpad function handheld keyboard for Android TV Boxes. (2) I thought if I install another card with a HDMI port I could connect the two directly, not sure what would fit into the Tower and be compatible at this point. Any and all suggestions to improve on this system for low cost would be greatly appreciated. Thanks Will...