Hi blocksta and welcome to the forum
It is shame that you now feel that bankruptcy is a better option, so have you firstly tried to see whether you could afford to offer reduced payments to your creditors? As you will also likely pay contributions under your bankruptcy for a further three years.
An IVA payment of £460 against income of £1,000 does appear to be very high. I feel that your creditors would rather agree to a reduced IVA payment than see you enter bankruptcy proceedings.
I suggest that you work out a revised income and expenditure account and send this to your own IP for their advice.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
To have me propose an IVA for you, please visit:
http://www.melaniegiles.com/ivaEnquiry.asp
See customer feedback at:
http://www.iva.com/iva_companies/IVA_Advice_Bureau.asp