Come back in June/July. Prices, availablity and products will have changed greatly since then.
Also, most people use Newegg links because it's easy to see what you're getting. You shouldn't expect people here to do all your work for you. Just take the products listed here and find them where ever you can buy from yourself.
I wouldn't know where to start w/ Irish web sites....so I apologize in advance for using US ones. As you might imagine, as these questions are asked frequently, many of us have small text files w/ the links readily available for cut / paste. You can ignore these or just use em to check the specs and pics....then try and find them on your favorite shopping sites. I tried the search engines on amazon and komplett and they were a bit difficult.
Note: ATI gaming cards and AutoCAD / Rendering has historically not been a good mix. True rendering or workstation cards i.e. the FireGL and Quadro are what you want for CAD / rendering ... they are not a good choice for gaming. If you are anti nViida, then I'd recommend separate boxes with a FireGL in the one you use when you render and a 5870 for when you game.
-Plenty of expansion capability in one of the best full tower cases (HAF 932 is a great alternate)
-PSU w/ 10.0 electrical Performance rating and the quietest hi wattage PSU tested at silentpcreview.com w/ capability for SLI or XFire and hi OC'ing....Corsair HX850 is a good alternate.
-HD which performs better than Samsung F3 in gaming and photo work, (F3 does better on movies and music)
-Low profile memory thatv doesn't interfere w/ aftermarket heat sink as often happens with the high profile heat spreaders on for example the Dominators and Ripjaws.
-Adequate GFX capability for DX11 gaming w/ 1 card at 1920 x 1200 and high settings at least thru XMas 2010....2nd card in SLI / Xfire can be put off till when needed; case and PSU has plenty of cooling and power.
-Ability for 200 BCLK and 4.2 GHz OC's.