hi guys
need an advise

my specs :

E8400 EO stepping
Biostar T Power I45
Power Color PCS + HD4870 1GB
4GB CellShock 1066 2,3V Micron
Seagate 750GB 32MB NCQ
ToPower PowerBird 1100W
Recom PowerStation with 5 fans

so one thing i am missing at this point is a good cpu cooler to start adventure with overclocking my system, can buy in 2 days one of these :

ARCTIC COOLING Freezer XTREME 72USD
Asus Lion Square 70USD
Magicool Liquid Cooling 100USD
Scythe Mugen 70USD
Rosewill RCX-Z5-Ultra 92mm x 2 Two Ball 81USD

thinking about purchasing Mugen, but its kind of huge thing and that's what makes me feel not quite comfortable, don't know why

so any advise will be very helpfull for me

thanx