Help me upgrade my servers

Ok so i currently run a 1950, 2950, dl 380, 1900, 2850, 19u coms it rack and a hp switch ??? 10/100 poe.

I'm keeping my 2950 and my 2850.

I am thinking about getting some dell servers like a r510 or a r710. I'm on a budget as i'm student can someone please recommend me some servers dell or other brands i also need a good reliable gigabit switch.

Also everything has to be a uk price and free shipping :)