Well you could put a 5770 in a micro atx case quite happily aslong as its got enough cooling, i recently built a mid range gamer with a 5790, this was the case i used which is similar to yours with a huge fan on top blowing air into the case
Aplus CS-Blockbuster-Storm Micro ATX with Side Window with 2x USB, 2x Audio, 1x Firewire (No PSU) £48
The new Blockbuster Storm full-aluminium case, which is a light weight with only 2.94 kg, has a flip-out handle in front for easy and comfortable carrying. The removable main board carrier and hard disk cage help to install sensitive components very easily and safely. In front there is a blue illuminated temperature display showing the temperature of the internal temperature sensor. The 22 cm sized blue illuminated adjustable fan on top provides a perfect and silent cooling system. Up to 5 disk drives can be installed in this case. The 120 mm back side fan can also be assisted by an optional 80 mm fan in front. For a better cooling there are also honey comb holes on the back side. This case is made for ?-ATX main boards supporting 4 PCI-slots and standard PS/2 power supplies (tested with high performance Tagan and long life Seasonic power supplies. 2 x USB, 2 x audio and 1 x IEEE 1394 Firewire port are easily accessible in the front. Two side windows demonstrate the inner life of your PC case. Due to its blue illumination on the top and rear the Blockbuster Storm is very suitable for gamers on LAN parties.
• High-value black coated full aluminium case
• Useful flip-out handle in front to carry it easily
• Perfect and silent cooling system by a 22 cm sized blue illuminated adjustable fan on top
• Removable main board carrier and hard disk cage for easy installation
• Blue illuminated temperature display
• Totally 5 drive bays
• Integrated 120 mm fan on the back side, optional 80 mm in front
• Two transparent windows for a perfect look inside
• For Micro ATX main boards (4 PCI slots)
• XL length: Standard PS/2 power supplies as Tagan or Seasonic fit inside
• 2 x USB 2.0, 2 x audio an IEEE 1394 Firewire connectors in front
• RoHS compliant
Manufacturer: Aplus Fan Bays: 1 x 120mm
1 x 220mm
1 x 80mm
Edition: Fans Included: 1 x 120mm
1 x 220mm
Form Factor: Micro ATX
Window:
Material: Aluminium Dimensions: 285 x 385 x 260 mm (WxHxD mm)
Front Panel: 1 x Firewire
1 x Headphone
1 x Mic In
2 x USB 2.0
Colour: Black
PSU : Weight: 2.94 Kg (Approx)
Drive Bays: 1 x 3.5" External
2 x 3.5" Internal
2 x 5.25" External
http://www.scan.co.uk/products/aplus-cs-blockbuster-storm-micro-atx-with-side-window-with-2x-usb-2x-audio-1x-firewire-(no-psu)
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