If you need 5V tolorent input level translators I like the 74ahc buffers (but not the transeivers). They have eliminated the substrate diode to Vcc on the ahc125/126 (quad) ahc365/367 (hex) and ahc240-244 (octal) (and probably the equivelent 5 series buffers) so the input will tolerate up to 5.5V while powered from 3.3V and outputting at 3.3V. Great for chips that are not 5V tolerant (which is a lot of them these days). For bidirectional the 74LVC8T245 is the best answer but smd only (the rest are available dip).
Peter