any reputable brand 19" or bigger LCD widescreen. For that card, i would avoid 1920x1080 or higher monitors as that graphic card is not powerful enough for recent games at that res. settle for 1650x1050 or 1440 x 900. If you play older games though, some do not work well with widescreen and you may want to keep your old monitor around for them.
what vertion gts 450 you have? i use a asus TOP gts 450 and max out WoW borderlands and mass effect 2 with no issues at 1920x1080
you mihgt have to lower the resolution for titles liek crysis or metro, but might as well get a really good monitor as it would then last you for another build or two when you cna get newerr and better cards
i've had good experience with palit, btu some people have had bad experinces admitadly the fan felt weak on the models i've installed ie light and thin, but i've never had issues with em to really speak of. but it only takes one or two times having to rma or one bad rma experience to no liek a company , i personally find the custom pcb palits to be prety nice but still in my own rigs use asus
personally, ive almost always bought the cheaper brands (powercolour, sapphire, inno3d) for video cards and never had a problem. Cant say the same for palit, but i wouldnt think they would be any more problematic than any other brand. But with custom PCB you can possibly go wrong over the reference design if it is not done properly.