That's a fairly slim budget for a decent mouse, keyboard, and headset.
Realistically, I would just stick with the XPS's keyboard (quite good as laptops are concerned - it even has a little screen like the G15), and spend the money on a gaming mouse and headset only. For the mouse, a great choice is the Logitech G5. It's a little older, and there are several newer and better ones out now, but it is still a quality mouse, and fairly cheap for a high precision laser mouse.
For the headset, the Sennheiser PC350 should be amazing, but it would put you above your stated budget (as it is usually around $140 by itself). For a lower budget, the Creative Fatal1ty gets pretty good ratings.
Now onto the mouse. For the price i still find the MX518 hard to beat. Its near imposable to make it loose traction and it will run 500 reports/sec(the 2 i have will). I use the G9, but its a little expensive for the budget.
Keyboard : The dell one
Mouse : G5 or MX518, whatever you get a better price on. Get a good hard(plastic/metal) mouse pad for a laser mouse(G5), it just works better.
Headset : I can not comment here i only use a headset for a mic. The Logitech one i have has bad headphones, but the mic works ok. Someone else help please.
Ok thanks alot for the help guys well i will go for MX518 for mouse and does anyone have any recommendations for a Logitech gaming headset? or shall i go with the Fatal1ty one?
Btw nuke,have u ignored me in Private Messages?
Ok thanks for all the help guys the mouse will 100% be MX 518 but still not sure about the headset.
Is LOGITECH PRECISION GAMING headset bad?
Btw nuke,i cant PM u either in UK or US forum they both say u have ignored me
I myself currently have a Logitech headset and its been good but i got problems now,a part of it is broken so i need a new one,i may tell my uncle to get me CREATIVE FATAL1TY which has a good price for UK.
And btw thanks for the links