Lomu,
As you know, I'm not a very good golfer but like you, I used to be a lot better than I am now. I bought professional quality irons from a place that had loaner sets of most of the top brands and after three months of switching them out every week or so I finally decided which ones felt better to me.
A lot of golf is confidence. If clubs feel good and comfortable to you, you will do better with them at whatever level you play.
If the person will let you, take those irons to the range a few times and see how they feel and whether they are comfortable to you and if they instill confidence or feel quirky or clunky (best words I can come up with, you'll know what I mean if you hit them a few times).
Club brand selection is a very personal thing and twenty people may give you twenty different answers about which brand is best, but what it comes down to is which brand is best for you, your swing, and your "mental feel".
Also, the shaft is important as in stiffness... it has to fit the speed of your swing. If you swing at a fast speed you need a stiffer shaft. If you swing slower you need a more flexible shaft. To determine that I actually had my swing speed measured by a golf professional. You may want to check with Mongkol Driving Range and see if they are capable of doing that and telling you what shaft stiffness would be best for your swing.
That's my two baht worth on the subject... and that's probably about all it's worth!
