I've got a Zalman 92mm fan on my MB and I've never had a problem with heat.
Second that. Zalmans are terific cpu coolers.. and most models are silent too...
like Cadderpidder said, the stock HSF on your graphics card should suffice, but you can monitor the temps on it to determine if you do need a VGA cooler or not (no point wasting money if it only shaves a few `c off)
Basic rule of thumb for an air cooled system is air goes in at the fronts and side and exits at the back and the top. Theres two main types of fan-based cooling solutions: the Windtunnel and the somewhat-silent-but-still-cool methods.
Mind you the windtunnel method will make your pc niosy as **** but damn cold inside..
First off, tie up any loose cables and rout them to the corners of the case and out of the way as much as possible. Clean out all the dust present in your pc (especialy the heatsinks) then take a look where you can put some fans in and what size it can take (usualy 80mm or 120mm), and how much fans you wish to put in. Common places are:
-in front of the HDD bay
-top of the case
-side of the case
-back of the case
-bottom of the case
After you found all those spots and bought the fans start installing them with the rule of airflow mentioned above. then plug them into the power molex going to your PSU into the "fan" power line if it has one or the normal 12v if it doesnt and get a 7V converter or a fan-speed controler if you wish to control your fans and make them a bit more silent with the 12v, and one of them into your motherboard's fan connector if you wish.. <<Note the windtunnel method maxes the fan's speed so you dont use the 7V/fan controller device, but you've been warned
If you are a bit adventurous then you can pull out the trusty cordless drill and (with the pc stripped first off course) mod your own fan holes or change the size of it..
You can use Speedfan and/or Everest Home to monitor your temperatures realtime.. and have a good dusting/maintanance routine (every few months or so clean out all the dust etc) and your pc should keep nice and cool
Liquid cooling is a hassle to set up for some people, having to screw, fix and seal things waterproof especialy if the case is quite small to work with.. unless you know what you're doing. Adding fans on the other hand is just screwing in 4 screws and pluging it in (wonders will never cease lol)... even if you dont get as efficient cooling, but still 'cold' enough
EDIT: Oh yeh, if you do wish to retain your sanity dont forget to buy fans thats rated 20dB or less (18dB is good) in its most silent setting, otherwise get a room for it..