ATI Radeon HD5570 with new 23" LG IPS Monitor - Upgrade card?

I don't wish to waste money but am thinking perhaps it's time to change my Video card. At present I have the Radeon HD5570 1GB DDR3 which is quite a few years old, it's still working fine but I have just bought an LG23MP65HQ IPS monitor.
I have connected the monitors VGA to the DVI output on the card, there is no DVI connection on the monitor only VGA and HDMI.
Would it be an improvement to use the HDMI cable connections instead of the DVI/VGA? The manual says that the HDMI is for Digital Video and Audio but it also gives a warning 'that it can cause compatibility problem.'

If you think an upgrade is in order any suggestions? All the manufacturers reckon theirs is best so it's not easy to select one. My budget is around £50-100.

Thanks

Alan.

Thanks, I use it mostly for data; Excel/Word/Emails, some photo work on posters. I do, when I am in the mood kill a few Aliens or battle away at some gaming, Quake/Halfllife/Bio-Shock/Call of Duty etc.

I will get an HDMI lead and see if it makes an improvement.

IF I decided to upgrade anyway is there a type/range more suited to my requirements you can suggest?

Regards
Alan.

Thanks for the fast reply!! My budget is around £100 much more and the Mrs will need a new outfit as compensation!

Regards
Alan.

Many thanks for the suggestion, had a quick peek and it looks great but will read up on it tomorrow, the 5570 has done sterling service but I know it is not a great card but was all I could afford at the time.

Regards and thanks again.

Alan.

Dusted off my credit card and have ordered the new card as you have recommended :). I did a Google search and looked on some websites and they gave some very positive comments, and as you say the price is very good for the specs (Not that I knew what most of them meant! )

Thanks for your input and I will let you know how I get on.

Regards
Alan.