Jeez... I opened this link thinking that you found out something about the new platform that made it unreliable or something...
I bought my first apple in september of 2004. It was a 15 inch powerbook G4, 80gb hard drive, 128 video card. (The 100gb option was getting complaints because of ping-pong ball sounds). If it didn't get rained on, I'd still be computing away with no problem!
That machine, despite being replaced by intel chipsets, dual layer DVD drives, bigger video cards, LED backlighting, More dense screens, bigger HD's, more memory, etc etc still ran as fast as it did from day one (Which, let me tell ya, next to any PC laptop was fast as heck!).
The screen still looks amazing, the body is still beautiful (A classic... just like the old 3 series, you'll never get tired of looking at them...) and the machine still handled everything I threw at it, without a hitch.
Technology is being updated daily. My 8gb iphone is going to be "inferior" in a couple months, My 2 year old TV is going to be inferior in less than a year, my 1gb flash drive is now one of the smallest ones on the market, my digital camera is a brick next to todays!
Yet... they all still work very well.... and they're all still worth every penny I spent on them.
I love to buy the biggest and baddest (Even though my wallet has to be tweaked to accomodate these things). If you buy big on certain things, like computers, you'll probably get a lot more out of them than if you bought the $600 budget model. So, I think there's no reason to hold out, unless you have a perfectly fine computer.
PS: If the next MBP is updates as extensively as it claims to be, you're going to probably want to hold out for revision 2 to avoid any problems apple looked over. So, you could be waiting longer than June (Or whenever they're coming out)
Just my humble opinion....