Look for the "RangeMax Next" range of 802.11n gear which runs at 270Mbps or 300Mbps depending on the router you have. The standard is still in draft form so you can't guarantee that future devices will be 100% compat with the Netgear interpretation.
I have a DG834N router which includes an ADSL 2 modem. Initial impressions are of a solid build and an almost instant startup and internet connection (unlike my old Linksys router which gave you time to make a cup of coffee before you could connect). This is the 270Mbps version - I got it because overclockers.co.uk were doing a special offer on bundles of the router and PCI card (cheaper than the cost of a single PCI card !!!) so I bought two and sold the second router.
The PCI card WN311B seems to work great in one of my systems, but the new system I built (based on an ASUS A8N32-SLI motherboard) seemed to have a compatability issue with it and my system randomly crashed (BSODs) with the card installed and a fresh install of Windows XP. Neither ASUS nor Netgear managed to track down the problem and so Netgear, after an email to their customer services, swapped it for me for a WN121T USB2 adapter which works great.
If I was starting again I would go for the USB adapter everytime.
I live in a stone built cottage with thick walls and under 802.11g I found I needed a repeater to get a decent signal - now I have no such need and access is at 270Mbps throughout the house.
The one annoying thing is that the device has to be out of your system when you install drivers (and that includes upgrading drivers requiring an uninstall of the current drivers and PCI card removal) so it is very irritating to upgrade drivers for the PCI card version - the USB version is obviously trivial. The only slightly annoying issue with the USB adapter is the cable is a fixed cable and is only about 2 feet long. I solved this by plugging it into my USB2 hub which I fixed to the wall with sticky pads and it now works fine and in a convenient place. You could equally well use a USB extension cable (there are loads of Belking cables which are very cheap and do the job just as well). I really can't understand why they didn't supply a couple of metres of cable !
The SC101 storage device works great (except for a problem with NOD32 AV which ESET are investigating - I have temporarily swapped to AVG and everything works fine). I have 2 x 120Gb WD Caviar drives installed in Mirror mode which provides a common network storage which is easily accessible from all computers and doesn't require loads of fiddling with Windows permissions. (Note drives can be partitioned into standard volumes and mirrored volumes and can be private or shared with or without password protection - when you switch on your computer the drives are mounted automatically as they were when you logged off).
If you want a printer server I would suggest using a wired connection to the router as I don't think there are any 802.11n devices ready yet.
The Rangemax Next stuff is backward compatible with 54g and 11b devices but obviously network speeds adopt the lowest speed. Having said that Netgear recon that 54g network devices gain a 50% perfomance boots with the Rangemax Next stuff though I can't see how this could work (I haven't tried it).