Originally posted by ckiang
If you are thinking of the 28DX, then get the 80DX. The 80DX costs $100 less than the 28DX. $540 or so only. 50DX is not worth the money - less power than a SB22S, but cost more and uses CR123s. 
Regards
CK
emm...half agree

my reason of choosing 50 over the other 2 are:
1) if u seldom take big party, what pay double for SB28 or 80 ? Sb50 is good for portrait, been using it for 1/2 year, no regret esp. the 1/2 price tag of sb28...but take note u can not rotate in the horizontal direction and not indicator for flash distance field.
2) the dual flash + diffuser mode that specially design for F80...wat else can i say ? i use it almost 80% of the time i use the flash exp big group.
3) the cheapest DX flash in the range...i'm trying to get a coopix5000 if i found some budget, so this small flash will not look odd if attch onto the DC.....but the SB28or80 sure make the combo unbalance.
4) myth on battery : i just change 1 set after around 10 rolls of 100% flash shot ( i deducted those non-flash count)...not really take suck lah...
5) if u die die want a bigger flash, go for SB80dx as what CK suggested...well for me, my 80% photo content is landscape, i'll rather spend the $$ for a 3rd party ultra-wide lenses
thought u can get other 3rd party bigger flash vs 50dx, but i just want Nikon

(i'm iron-tooth lah..)
if u are party photogrpaher eg. wedding, D&D....GET THE SB80DX...no compromise...