Graphics Card Upgrade Advice For a Dell Studio

Hi guy's, new to here so thanks for the advice in advance - and apologies if this is posted in the wrong place etc!

I currently own a decent Dell Studio 540 pc, approx 4yrs old.
The specs are:

Intel Core 2 Quad Q9400 2.66 GHz 2.67 GHz
4 GB Ram
NVIDIA Geforce 9800 512MB GDDR3 (PCI-E slot)

My situation is, i'd like to moderately upgrade the gfx card on a max budget of approx £100. This is for a couple of reasons.
Firstly - I'd like a HDMI output as im wanting a larger monitor upgrade (currently have a 19" and want to go to a 23" using HDMI connection) and the current card doesnt have HDMI facility, though it does have a DVI which i currently connect with.
Secondly - It would be nice to play games a little smoother. The only games i play on my pc are Warcraft and SWTOR both of which ran surprisingly well on my old card at 1440x900 res in mid to high end gfx settings (wow runs at almost 60fps). Though at 'full' high settings they do suffer from some lag and frame-rate issues. The other thing is that i'd like to run the games at the new higher resolution of 1920x1080 which my new future 23" monitor will display on decent level detail settings!

The catch here is that I really don't want to have to upgrade the power supply, which i'm aware is famously low Dell pc's like this at only 300-350w, as I'm really not tech capable with pc hardware! I've spent a lot of time last few days looking at possible gfx card upgrades on the net and found only a few which seem to me would be viable in this circumstance:

Asus Radeon R7240 or R7250 (they only require about 70w supply is this correct!?)
Asus AMD Radeon HD 7750 (found a user review saying it worked with his 300w psu!)

My most important question is, would these cards indeed work on my pc with it's current power supply and which is the best one? Would they be a significant enough upgrade over my old gfx card? And as an extra, how would they cope with running games like SWTOR and World of Warcraft at on a bigger monitor at a higher res of 1920?!

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