1. How often do you play, how serious are you? I really like badminton, I will play for life 2. What style of player are you? (Aggressive smasher, net player ...) mainly drop, and then smash 3. Do you care much about durability or is it all about performance? yes i do 4. How much money do you want to spend? Lower than $150 Im looking for a 4U even balance racket, can be any brand. can you guys look in to RSL rackets, first http://rslnorthamerica.com/index.php?main_page=index
Go for Yonex Voltric 7, its a bit head heavy but once you put the overgrip it feels even balanced, very good at drop and smashes, also defensively you can use it really well due to its unique frame. else you can go for Nanospeed series from yonex, but durability wise, I doubt those.
just to clarify, any good racket can take 28lbs, but for Yonex, your warranty will void if you strung that high 28 lbs is not the highest tension, it is the maximum tension they cover for warranty
I would avoid YY made in Taiwan range. So probably discount Voltic 7. Maybe look away from YY. If you are a doubles player you might want to try a Victor BS10. Apace Tantrum 200 is good if you can find it.
I use even balance 3U Cab but have found the 4U AT600 quite agile with good smashing power. Can't help you on other brands though.
Made inTaiwan is a definite no no of course. So Voltric 7 should be out of consideration just, but since the frame is hm graphite, it will b durable, however there are other areas to look at as well.