5MB - you didn't say what you have now.....
I use a 6-year-old PIII 500 with 256Mb running a stripped-down, custom installed Windows98 (2nd).
In the past year I have set up 2 desktops and a laptop for other people - all much more powerful than mine and all running XP. All 3 run slower than my machine!
I don't do heavy graphics or movies, do surf all day, every day and do WP, spreadsheets, accounts. ADSL is the greatest go-faster gizmo around (I have an internal DSL modem and share the connection with one other machine).
Do get USB ports (you don't say how old your machine is) - they are very useful.
Make sure you have a good backup method and USE IT DAILY. Then you can recover easily from any crisis.
HP make great printers - I am on my third in 14 years and only change when the technology leaps forward. Will be buying the printer/scanner/copier thing when my ink supply runs out - I think it's £99!
Don't waste your money unless there's something you really want. PCs are upgradeable........