Borys, maybe you can hijack your PC monitor for the PS3? Dunno about your setup, but maybe you have a DVI-capable monitor - the HDMI->DVI adapter should be cheap.
There are even prefabbed cables (like this (http://www.dealextreme.com/details.dx/sku.37234) one) that have one DVI and one HDMI plug. Small wonder, since DVI is basically HDMI 1.0 with a different plug.
spoiler (click to show/hide)
For reference, and because I feel bad for laughing:
My TV is a LG 37LH3010. 350€ at a sale.
(http://i.imgur.com/YaXJ0.jpg)
Spent ages to get into the service menu to enable the (LH4xxx series) USB media player, then never used it. :dur
Decent TV.
You have a 60 foot screen? :o
spoiler (click to show/hide)
;)